Not as interesting as you think.
Methinks that the final-battle will be won or lost, won and lost in issue 11.
Issue 12 is probably about Aftermath.
Like the last 5 hours of the 3rd Lord of the Rings Movie.
How screwed over and fucked up all the characters are due to the finalizing consequences generated form issue 11.
This mini is all about Bendis transitioning from Avengers to X-Men right?
It's possible that for some time he thought that he was writing the final issue when he was really in fact putting 11 to bed?