I really have no idea. It could be possible.
I will only buy the books if it is a significant improvement over 3E. I really don't think my group or DM will want to, however. My DM has just now finally started to embrace most of the options of 3.5 and use the splatbooks (thank goodness), and he would e highly resistant to a new edition. If it is good enough, however, I will bu the books and use it for the games I run.
If it is a significant improvement, that is.
But I still see room for lots more 3.5 material, and can't really imagine what they could do to improve the game that much. If it is more miniatures focused, I wouldn't touch it with a 10 meter cattleprod. If it is anything like a board game with collectible elements *shudder/vomit* I wouldn't touch it with a 50 meter cattleprod while wearing a hazmat suit.
3.5 fulfills all of my D&D needs. I won't claim that they couldn't blow me away with some new ideas, but what I want from a D&D game is character customizability, not simplicity or "ease of play" (whatever that is) as some people say they want, and if a new edition makes any sacrifices in character customization to make play speedier or simpler, I won't be interested in the slightest. I want to make my character exactly the way I want, and to have mechanical benefits befitting the roleplaying concept (if I say my character is a swordmaster, I want mechanics to support that assertion rather then him just being the same as any other Fighter with a sword, for example.)
If, however, they make the game less miniatures focused (which I know they will not do) while keeping all of the tactical options they have in 3.5 (Attacks of Opportunity or a similar mechanic) then I will rush out to get the game while giggling like a 12 year old Japanese girl going to get a Hello Kitty backpack. But I have the nauseating feeling that, considering the apparent success of D&D minis and the love of miniatures that most gamers seem to have, I am going to be SoL.