The two main problems with 4E are that, especially at higher levels, combat becomes slow and boring. You can say the same about the other editions, though.
The biggest thing, for me, is that codifying everything into powers, most of which are only useful in combat, takes away a lot of the freeform creativity that's a big part of the game. In older editions, we'd combine spells and create elaborate plans that resulted in ridiculous and fun things happening. That's not impossible with 4E, but the way the game is built tends to work against that kind of play.
What goes on in the corporate/Hasbro side is anyone's guess.