FWIW, Dave Fetterman, the Facebook's former head of dev relations who helped create the Facebook developer platform (developer.facebook.com), later led mobile at Facebook and was the one who made the call to go HTML5 and then made the call to switch over to native is back working on high performance HTML5 at famo.us as VP of Engineering.

There is still a future for for pure web apps that feel great. The framework will be released on Wednesday night.

disclaimer: I work at famous.