For those of you that don't follow Tom on Twitter (I admit I don't since I don't have an account, but he's part of my Google Reader feeds).
Here he says that according to this ND is cancelling its 2013 game with Army. Most teams take 2 years to join a conference and one of the reasons that people thought ND wasn't happening is that their OoC schedule would already be set with all of their none-B10 contracts.
And there's been more smoke around the idea of the Big East actually issuing the "get in or get out" ultimatum to ND. Maybe there's fire.
Let the speculation begin. I sure don't have any insider information.
Note: I did a quick search for the link I posted and a few other keyboards. I didn't find anything so I believe this is new to the board. If not, then I apologize for the mistake.