Originally Posted by ThePowerCosmic
Killian, Crossbones, Red Skull, Malekith and/or Kurse, Abomination, etc. I could see them working together, all assembled by Thanos(they don't have to know that), like Fury assembled the Avengers.
Probably close to the roster we'll get.
Red Skull is a bit of a question mark. If he does return, he'll likely be under the control of Thanos after teleporting to parts unknown in TFA.
Also, if he returns, he probably won't be played by Hugo Weaving.