So, my guess:
-likely a Goblin Queen
-likely a DarkChylde (demon or fully armored)
-Inferno-corrupted versions of X-characters (Malice is probably too much to ask for, but one can hope)
- I hope S'ym/N'astirh (or both!!!)
-Maybe that new Mister Sinister finally sees the light of day
-oh, and the mini has gotta be either baby Nathan or age-regressed Illyana