According to HitFix, it has been confirmed that Rob will be presenting at the Oscars. This seriously surprises me, and to be honest, I'm still not convinced. They don't offer any source or reference and leave themselves a way to back out of the story. You can read more about it here. This just seems out of character for Rob, and I'd say if he does make an appearance it's at the strong urging of the studio. I don't see him leaving London any sooner than he has to. You can't blame him for not being eager to jump back into the craziness his life is when he's here.