Well, I have a soft spot for Michael, thanks to the Lucifer comics (among other things), so I hope he's not in on the Armageddon party (though I am not counting on it). I also kind of think there should be some Michael v. Lucifer sibling rivalry involved, where when Michael comes back he's all, "dude, you think hell was bad? I've been putting up with God for eons and he's all, 'what have I done? I miss Lucifer! He was always my favorite!'"