I hope it is Undertaker, so we can get streak vs streak at WM
but think about this, WWE needs to get more main event stars, 2 years ago, del rio got a main event status after his rumble win.
this year, my dark horse is Jack Swagger, i mean he went off to repack his gimmick, give him a face turn, a good manager and a new finisher and believe me, he got the in ring skills to get the job done. The rumble would be a good platform to start his main event status.
I know it is inlikely, but i hope they consider it