I'm only just now getting through some Dreams demos I've had in my watchlist for months, and I'm glad I have. The simultaneous breadth and accessibility of the creation tools is amazing. Music and sculpting are particularly impressive. The gameplay is showing more body too with some legit looking platforming rather than just the awkward marionettes we saw previously. And goddamn that art...like impressionist paintings come to life.
I'm still not sure how satisfying this will be as a traditional game (or even for making your own 'finished' work) but the creative potential is off the charts. I can easily see myself using this to turn my own dreams into mock ups and proofs of concept (hence the name). It'll be great for people without formal training or specialized skills to put their ideas on screen to convey to others.