I won't lie, I also find it a bit sappy Sasuke and everyone is turning "good" for now (though more than likely it's more recognizing Madara and the 10 tails are pretty much universal threats that mean the end of their world if he's not stopped). But fuck yeah, 4 Hokages going into battle against the 10 tails, Obito, and modified Madara, should be pretty cool (even if this is gonna take away from the whole Naruto spotlight).
And man this is gonna be awkward for the 4th, he still has no clue Obito is Tobi and the masked man from that night long ago, he still thinks it's Madara probably. Not to mention he gets to see his son and Kakashi again. Queue in lovey dovey reunion chapter, more than likely with him yanking them both out of death's way.
Couple of other thoughts:
Karin is related to the Uzumakis...guess that could make sense given her red hair, and that's supposed to be a defining Uzumaki trait. In fact, have only the Uzumakis had red hair so far? Guess it could explain her whole healing ability too since Uzumakis have big chakra reserves.
Suigetsu totally has the right idea of ditching them, between 4 zombies and 3 monsters and a love-struck weirdo, that's not very good company to be in...