Just confirmed, full info:
http://www.atpfestival.com/Events/TenYearsOfATP/News/0907081005.php

So the current lineup is:

YEAH YEAH YEAHS / MODEST MOUSE / THE BREEDERS / EXPLOSIONS IN THE SKY / BATTLES / STEPHEN MALKMUS AND THE JICKS / DIRTY THREE / TORTOISE / SHELLAC / MELVINS / MUDHONEY / J MASCIS AND THE FOG / THE FOR CARNATION / PAPA M / SUNN O))) / DEERHOOF / THE DRONES / SLEEPY SUN / BARDO POND / FUCK BUTTONS / APSE / ALEXANDER TUCKER & DECOMPOSED ORCHESTRA

we'll have more MBV weekend additions very soon.

Tickets for both fests at http://www.atpfestival.com. Self catering just sold out for MBV, only limited 4 berth room onlys left for that weekend.