Overall a pretty weak lineup in my opinion, especially the headliners. Calvin Harris? Skrillex? Yikes. Eminem and Kings of Leon aren't my cup of tea but I think they are decent choices. Arctic Monkeys and Outkast both should be good shows.
I went to Lolla in 2010 and had a blast. I don't know if I would go back now, every year it seems the lineup is weaker and weaker. I don't know if my tastes are just changing or the festival industry itself is faltering, but it's an interesting question.