I've been sharing Dreams-GIFs on the PS4 subreddit, and there's definitely a huge market for Dreams. My most viewed GIF got 9K upvotes (which is quite a lot on that sub). People seem to get absolutely excited for the game once they actually get what it's about. The beta will be a huge change in the game's perception and awareness.
Yea, I hope we'll quickly see a lot of games with the quality of that multiplayer hammer game they've shown a few times. Afaik some of the best LBP creators are already involved in the closed alpha and I'm very interested what these guys are/have been working on - guess we'll know once the beta opens.