So it was confirmed at the Mego Museum forums that the next four Marvel sets are (in no order)
Spider-man (including 2099 but we don’t know who else)
OK, I’m surprised about Iron Man as well but the character selection does seem somewhat well thought out based on popularity and media attention. Still hoping for something a little more classic in wave 3 but people have been wanting a 70s Mego style DD and Punisher for forever and a day.
Hopefully something retro cool like the Electric Company or Japanese Spider-Man ends up in the new set. I am going to assume that the black suit is a given.