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Ravenspyre, minion and pet are not exactly the terms for the astral construct. I am currently working on the Astral Consruct right now, and it is sorta complicated to explain it.

Eldritch_Lord, good job explaining the main points behind my class.

More Ideas:

If you define your Striker Damage as psionically charging a weapon, you could use the following mechanic: Minor action anytime during your turn to charge, free action to spend (max 1/r).

You could make a multitude of feats/paragon features/powers that let you charge your weapon, for example, after killing an enemy or as result of a power.

With the same mechanic, or a parallel one, you could use the old Psionic Focus concept, to something similar as channel divinity.

You could give the psion the ability to use Psionic Focus, and each discipline a different use to it, that would give a good starting utility-type encounter power. (again smiliar to channel divinity). Dimension Swap would fit the bill. Again powers/feats/features could let you recharge your Focus.

I don't think the check is necessary. Seems like a 3e relic to me, also I'd punish the player for taking the (as striker much needed) action to deal its additional damage if the check fails.

You could add a "psionic gamble" to the extra damage (wilder, anyone?), by making a check or saving-throw-style roll for a random modifier to dmg *g*. Again, feat or paragon feature possibility.

The minor action should be enough, both ranger and warlock spend their minors on dealing additional damage, but their's stay.

Great! And now, further onwards....

Psionic Focus: Powers with the psionic focus keyword need you to have Psionic Focus. Your Psionic Focus is spent after using the power.

Psionic Focus

Psion class feature
You focus your mental energies to later release them.
At-Will • x ; Minor
Personal
Effect: You gain Psionic Focus. You can keep your Psionic Focus for 5 x min, until you take a short rest, or until you spend it. You cannot have more than 1 Psionic Focus at any time.

Psychic Discharge

Psion class feature
You infuse your attack with your mental power.
At-Will (Special) • x ; Free • Psionic Focus
Personal
Effect: Add 1 x d6 psychic damage to any damage roll you just made. This damage increases to 2d6 at 11th Lvl and to 3d6 at 21st.
Special: You cannot use this power more than once per round.


As for the 3 paths Shaper/Nomad/Egoist, I'd make them builds of the Psion. Psion base ability: Int, secondary ability according to build:
Shaper: Wis
Nomad: Dex
Egoist: Str

I'd make 4 powers for each lvl, each usable by all builds, but with benefits to the different builds. Egoist gets Int-based [W] attacks with Str secondary abilities, Shaper gets 1-turn summon effects with Wis-based effects, Nomad gets mobility bonuses (additional shifts etc.) based on Dex.
It may be quite a lot to balance out, but you're trying to make a class that can incorporate 3 different classes. :D

As to the themes of the powers:

Shaper: Ranged attacker, conjures construct to gain effects (similar to artificer?), gives some bonuses to the party.
Nomad: Melee/ranged attaker, mobility specialist, focus on teleportation effects
Egoist: Melee attacker, reduces enemy stats, self-buffs through attacks.


Each build should define your base at-will and a Psychic Focus option. Let's see...

Standard Attack At-Will for all builds:
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Mind Blast

Psion Attack 1
At-Will • x ; Standard • Implement, Psychic
Ranged 1 x 0
Attack: Int vs. Ref
Hit: 1 x d10 + Int Mod psychic damage
Increase to 2 x d10+ Intelligence or Wisdom Modifier .at 21st level
Special: This power counts as a ranged basic attack.


Shaper

Crystal Shard

Psion (Shaper) Attack 1
You launch a crystal shard at your enemy that burrows into his flesh.
At-Will • x ; Standard • Implement, Force
Ranged 1 x 0
Attack: Int vs. Ref
Hit: 1 x d6 + Int Mod, increase to 2d6 + Int Mod at 21st Lvl.
Effect: At the end of your target's turn, deal an extra 1 x d6 + Int Mod damage to him unless he spent a move action to remove the shard.


Momentary Construct

Psion (Shaper) class feature
You create a hasty construct out of pure thought.
At-Will • x ; Move • Psionic Focus, Conjuration
Ranged 5
Target: One square
Effect: Until the beginning of your next turn, you create a construct. It blocks movement for your enemies, blocks line of sight and line of effect as an ally would, and counts as ally for purposes of flanking.


Nomad

Translocation Strike

Psion (Nomad) Attack 1
With a strike of your weapon, your enemy reapears someplace else.
At-Will • x ; Standard • Weapon, Teleportation
Melee weapon
Target: 1 x creature
Attack: Int vs. AC
Hit: 1 x + Int mod damage. Increase to 2[W] + Int Mod at 21st Lvl.
Effect: The target teleports 1 x square in a direction of your choice. If it ends its movement in an occupied square, the movement is cancelled.


Dimension Swap

Psion (Nomad) class feature
After a mental message, you and an ally change places.
At-Will • x ; Move • Psionic Focus, Teleportation
Close Burst 1 x 0
Target: One ally
Effect:You and your ally swap places, if your ally is willing.


Egoist

Strength of my Enemy

Psion (Egoist) Attack 1
Your strike gives you your foe's strenght.
At-Will • x ; Standard • Weapon
Melee weapon
Target: 1 x creature
Attack: Int vs. AC
Hit: 1 x + Int mod damage. Increase to 2[W] + Int Mod at 21st Lvl.
Effect: Until the end of your next turn, your target suffers a -1 x penalty to damage rolls, and you gain a +1 bonus to damage rolls.


Graft Weapon

Psion (Egoist) class feature
Your weapon merges with your hand.
At-Will • x ; Move • Psionic Focus
Personal
Effect: Until the end of the encounter, you cannot be disarmed, and you gain a +1 x bonus to attack rolls.