"In response to player feedback" actually means very little, since I have no idea whether my desires are the majority, the minority, or even really being transmitted to the developers. They have their own way of reacting to things and perceiving things, so there is no guarantee that something they previously "promised" can't end up being left by the wayside, if, for example, it interfered with some new design goal they thought up.
I also have a hard time really confirming that "the major design goals have remained consistent" when those goals rely on things that haven't been revealed yet (and thus cannot be tested as to whether or not they are actually functional and accomplish their stated goals). For example, it is promised that we'll be able to make encounters as long/tactically interesting as we want, yet there are no real tools to aid DMs in creating elaborate and interesting encounters, only short and mind-numbing ones.
In short, I will believe it when I see it.
3.5-style multiclassing doesn't have anything to do with what I'm talking about, and in fact I don't even really like the concept of it.