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I went undefeated with a mid range W/G deck. My most reliable beater was the 3 copies of Seraph of Dawn . It combined with one each of Champion of Lambholt , Moonsilver Spear , and Howlgesit . I also had a Seraph Sanctuary . That allowed me to constantly gain life, often ending above 20. The evasion on all my main creatures allowed me to get past defenses, while the spear kept giving me more beaters and defense.

I went in hoping to draw a highly aggressive R/g deck with Vexing Devil and Thunderous Wrath . But, I only had one good red card. From my view, The G/R decks will put you in a tight spot, but if you can stabalize, they don't have much that can overcome (other then the Bomb Rares).

I went 3-1 using following 40 cards:

10 Forest
7 Island

Green Creatures
1 Champion of Lambholt
1 Timberland Ranger
1 Gloomwidow
1 Trusted Forcemage
1 Nettle Swine
1 Druid's Familiar
1 Pathbreaker Wurm

Blue Creatures
1 Captain of the Mists
1 Galvanic Alchemist
1 Latch Seeker
1 Mist Raven
1 Gryff Vanguard
1 Havengul Skaab

Green Spells:
2 Abundant Growth
1 Terrifying Presence
1 Blessings of Nature

Blue Spells:
2 Ghostform
1 Peel from Reality
1 Crippling Chill

White Spell:
1 Defang

Artifact:
1 Vessel of Endless Rest

Had a third Ghostform but decided 2 main is good enough since I paid particular attention to my creature count. There was a second Defang but my inital thoughts was to have one main only but given 2 Abundant Growth and 1 Vessel of Endless Rest, my mana would've supported the second copy and I could've blanked out more bombs than the bounce spells could.

Lost third round due to a misplay on my part. Nevertheless, the deck was incredibly aggresive to my surprise, the 3-drops were exceptionally on point and soulbond making things even more difficult for my opponents. The flyers never met much opposition at all. Most games I have one Ghostform waiting for the lethal and a tapped out opponent. Favorite moments were bouncing the Forcemage and my creatures that got Defang-ed with the Skaab and hitting a third-turn Gloomwidow or Captain followed by fourth-turn Forcemage (would've preferred the Familiar but the Forcemage was more consistently drawn). Last match of the pod was a fourth-turn Swine pumped by Blessings of Nature a turn after, knocking opponent's life from 23 (he Naturally Ended a Growth) to 0 in three consecutive turns.

In hindsight, I guess I could've made it 9 Forest and 8 Island but I never felt manascrewed given the mana fixers and cantrips of the deck.

The format was dry of hard removal but the bounce spells were a-plenty so gravitating to blue and picking a second color seemed the natural thing for me. During the next pod, I went 2-2 with a UW deck which included nearly the same blue bounce/tap spells and highlighted by 2 Emancipation Angels and 2 Call to Serve. First loss was due to an opponent playing 3-colors outdrawing and outpositioning me in the board while second loss was due to flooding and dry creature draws. The deck would've been perfectly synergistic (as noticed by another player there) given the Angels, 2 Peel into Reality, 1 Cathedral Sanctifier and 1 Angel's Tomb but I was worried about the manabase and the higher-costings spells causing me to go 18 lands. Best moments were stealing a Wolfir Avenger with Spirited Away during a standstill and an opponent's Nettle Swine (his only bomb on that game) with same enchantment.

Hopefully I can play Sealed during the release party and if I get to have 2 Abundant Growths and plenty of bounce again, I'll go UG again.

Got 3-1 with a WG Soulbond-heavy deck, and a lot of the games I won involved Seraph of Dawn paired with Wolfir Silverheart . Life gain is amazing in Limited. I quickly got the achievement of gaining 10 more than starting life. Most non-life gaining decks cannot win the race with a 6/8 attacking in the air. I would have wanted to make a UW aerial assault but my blue card pool didn't look good. The three copies of  Seraph of Dawn really rocked the house. My losses was mostly due to mana screw.

Wolfir Silverheart was very nice and even Trusted Forcemage and Druid's Familiar when paired with  Seraph of Dawn . Some other notable creatures I used were Nearheath Pilgrim , Pathbreaker Wurm - all enabled by the great Wolfir .

As an aside, my rares in the first 6 boosters were kind of underwhelming, but winning 3 rounds and opening a Tamiyo, the Moon Sage on one of the price packs more than made up for it. Just on my third PR, and I can say this was my greatest so far.

8 Plains
8 Forest
Cavern of Souls
Scroll of Avacyn

Nearheath Pilgrim
Thraben Valiant
Devout Chaplin
Farbog Explorer
Moonlight Geist
Seraph of Dawn
Goldnight Redeemer
Righteous Blow
Banishing Stroke
2x Cloudshift
Leap of Faith

Ulvenwald Tracker
Timberland Guide
Wandering Wolf
Nightshade Peddler
Trusted Forcemage
Druid's Familiar
Nettle Swine
Wildwood Geist
VorstClaw
Terrifying Presence

I was a bit underwhelmed by the removal available in my pool, so I decided to focus on the colors that gave me the most cheap creatures, a few bigger ones, a little evasion, and as many wacky tricks as possible.  

Leap of Faith does everything - save a creature from death-by-damage, surprise block an incoming flier, or jump over a defending ground force.  I did all three at the prerelease.  Cloudshift also does a little of everything - it was very handy for dodging enemy removal, and I also got to use it to reassign pairings for Soulbond creatures, often in the middle of combat.  Heck, once I even used it to bring a creature back to the field untapped just so I could surprise block, and once to get an extra +1/+1 counter from Ulvenwald Tracker.  Terrifying Presence is the best Fog variant ever.

Ulvenwald Tracker was amazing, particularly any time I also had the biggest creature on the table.  In one game I had it teamed up with a lifelink creature that could fight and kill a possible blocker and then still attack, gaining life both times.   I won that game at 41 life. 

I also expected sealed to be a pretty slow format. Except when i glanced through the spoiler i noticed red is meant to be pretty quick. And when i opened my cards i knew i had to go R/W. I had one of the fastest decks you could have for a sealed pool. my best card for me was prolly Gallows at Willow Hill that helped me win a couple longer games. My deck went 4-1 with 2 of my matches lasting no more than 10 minutes and another less than 15. Anyway here is my deck and  im interested in ur thoughts. Nothing in my main deck costs more than 3.

LANDS 

       8 Mountain
       7 Plains
       Cavern of Souls

CREATURES

       Devout Chaplain
       Farbog Explorer
       Moonlight Geist
       Nearheath Pilgrim
       2 Thraben Valiant
       3 Fervent Cathar
       Hanweir Lancer
       2 Kruin Striker
       Scalding Devil
       Somberwald Vigilante
       Vexing Devil

ARTIFACTS

       2 Bladed Bracers
       Gallows at Willow Hill

SPELLS

       Defang
       Divine Reflection
       Zealous Strike
       Lightening Prowess
       Pillar of Flame
       Uncanny Speed

Gallows was definately my best card when it was in play if my opponent wasnt dead yet. Lightening Prowess and all the vigilance in the deck work very well with it. And the Scalding Devil can also help finish off a player if they can stabilize. Didint have much of a sideboard for this deck but Guise of Fire and Vigilante Justice helped me win a game against another weenie deck with a couple wingcraters and some other one toughness creatures