So every year there are at least a few surprise appearances made by other artists during the featured artist's set. Last year, I saw Fly-Lo come out during Gaslamp Killer's set and Thom Yorke come out to sing "Shipwreck" during Modeselektor's set. There was also talk of Eminem and 50 Cent coming out during Dr. Dre/Snoop. Oh...and the hologram thingy.
Any predictions for likely surprise collaborations/appearances during 2013? I saw a few threads talking about Daft Punk coming out during Phoenix, but none about something more plausible.