If they're going with General Lukin as the man behind Winter Soldier like it was in the comics (the animated series had Bucky working for a newly-returned Red Skull, which would also work in the movie if they felt like it)....
Aaa, spoilers! We Americans are still only halfway through the current season of Avengers: EMH
. We only just saw "Secret Invasion" today. So please be more cautious in the future when discussing the second half of the season. (Although I'd actually already guessed that the guy WS was answering to in the first Red Hulk episode was probably the Skull...)