The 30 card minimum is going to feel like pack wars. You take a 14 card booster, add 2 of each basic land, shuffle it up, and that's basically what you have. The four combined boosters will ensure that every card in your deck is playable or otherwise non-blank, which is definitely a positive change from pack wars.

I know nothing about limited, but I think this will play wildly different from either draft or sealed. I think entire games will be decided by the following question: if both players put their entire libraries into play, who would win? 30 card decks are stupidly consistent. If your opening hand is 7 or 8 of those cards then why would you ever mulligan? This is practically freeform. Your Kiln Fiend deck will work every single game. But I don't think tht's a bad thing! Bring it!

So decks are going to be, what, maybe 12 lands and 18 other cards? People might find "favorite decks" that they play every event. Strategies would be posted on the Internet in the form of "Build your pool of 18 from as many of these 14 cards as you opened." I mean, there are many fewer variables to this format than in sealed, less to evaluate, and more obvious choices. It might be a degenerate format in certain blocks. I guess we'll see.