A. Of course. It's Deadpool! And lately he's EVERYWHERE! C. X-Force are an undercover black ops X-Men team. Normal, black outfits are the must. He's worn it for a bit now, at least in the current X-Force book. Also towards the end of that whole mess with the baby. They're hunters, and must blend into the night. D. There are actually more people there too, but these scans don't show them. Warpath: Apache mutant who is very cool. Vanisher: Freaking douche bag, with lots of tattoos. Then the people you don't see: Angel: Current Archangel. To understand THAT I suggest picking up the X-Force books, cause seriously... I was confused as hell until I did. Elixir: Yeah.... read X-Force for THAT confusion too. X-23: Wolverine's there, so she's gotta be too.
E. They are in the future because Scott Summers is a douche bag! But you don't get to see that in those scans or in the little flash back. Actually, they are there to fall right into Bishop's trap, and to "help" Cable. Giant bone monster is actually a mutant hunter, who likes to eat mutants. Yum.
D. Only 3 of X-Force have red lenses in their masks. Warpath, X-23, and Wolverine. I guess it goes along with the: We're hunters, we're animals, FEAR US! Type thing.