I doubt they'll ever get Chris Evans back, but that would be something to see.
I'm curious as to how Taskmaster will end up being with the Thunderbolts. In Black Widow, it's shown her leaving with the other Widows. But in a deleted scene, it was shown that she was taken into custody by Ross, along with Natasha.
I find the hatred this is getting to be both amusing and baffling. As soon as Valentina showed up to interact with Yelena and Walker, I knew they would be part of a team she was putting together. And as soon as they announced the Thunderbolts movie, I knew immediately that it would probably be made up of secondary characters already showing in previous movies. Ghost was a given for me, and I kind of figured that Taskmaster would be there as well. I will admit to being surprised about Bucky and Red Guardian- I figured Bucky would still be working with Sam. And I honestly didn't know when, or even if, Red Guardian would show up again. And Feige has already shown that he doesn't always adapt the material exactly how it was in the comics, so things being changed didn't surprise me. And for all of the talk of Zemo leading the team (which I know he did in the comics), I think right now it's being lead by Clint Barton, so it's not unusual to see the team being led by a hero.