I'm not thrilled to see people from the 4e design team on board. I think it is the worst edition of D&D to come along, and the design team's attitude toward players of previous editions didn't sit well with me either.
I'll keep an eye on 5e, however. If they release something great, then I'll buy it. Short of that, I'll stick with Pathfinder and the other games I play. D&D no longer has the brand loyalty/connection it did for me prior to 4e, so I don't have any kind of emotional investment in liking 5e when it comes out.
The stated intentions are a bit worrisome, just because I think they'll be extremely difficult to pull off. There are some fundamental reasons why some like or dislike 4e as compared to previous editions. Trying to "marry" those differences into a single system that appeals to both groups is more likely to alienate both groups.
But my curiosity is aroused, and as I said above I'll be keeping an eye on 5e.