I've read the 4E books and played a couple of demo games.
Sadly, I won't be investing in 4E either as a player/GM or as a publisher.
For one, the GSL License Section 18 is the deal breaker. WoTC knows where they can stick that one. I can see similar concepts, happens often enough. But Storylines? Other content (i.e. Characters)? I think not. They want to walk a fine like under the GSL for being able to copyright infringe with our permission, and that's a business game I won't play.
Second, I just don't feel the new system is all that great. Pound for Pound, Star Wars Saga is better.
Third, I much prefer what I have seen of the Pathfinder RPG, but might just continue playing and supporting Green Ronin's True20, at the end of the day.
All in all, there is nothing from a gaming or business standpoint that makes me go "wow" for 4E.
Regards,