Game Informer Executive Editor, Andrew Reiner, has said the next issue of the magazine will feature an unannounced sequel.
The issue will have Elder Scrolls V: Skyrim as its official cover, to be revealed tomorrow, but Reiner tweeted this last night:
"In addition to Skyrim, this issue holds an unannounced sequel. Guess away!"
He went on to add the game was not another Bethesda sequel that was yet to be announced. So no DOOM 4, Brink 2 or whatever Tango or Arkane is up to.
Game Informer EiC Andy McNamara has said the issue will start hitting subs by the end of this week or early next week.
Let the guessing games begin again.