Can't find the old thread if one even existed.
Lineup by day according to the site:
Friday: TiŽsto, Bloc Party, The Ting Tings, Santogold, Roni Size Reprazent, Carl Cox day 1
Saturday: Cut Copy, Deadmau5, Crystal Castles, The Presets, Hercules and Love Affair, Simian Mobile Disco, Busy P, Carl Cox day 2.
Source: festivaloutlook.com, ultramusicfestival.com