I'm firmly of the opinion that we're looking at:
Rodrigo (reliable info, and always seemed likely anyway)
Fred Again (no real info, but I've been convinced pretty much since the last festival that he'll do it for a whole host of reasons. He's absolutely massive and at the height of the wave he's riding. It just seems a no brainer to me)
Third slot - dunno. I know Eminem was offered but, personally, I don't think he'll do it. The offer will probably be met by a raised eyebrow (he was paid seven figures to do Reading & Leeds). I also don't now much about his touring plans though, I don't really follow him. No idea who would take up the third slot right now, which I kind of like.