High hopes for this show. The little teaser film on Avengers was great (shame they aren't reusing any of the actors). They'll just have to be careful of which characters they use. Would be a shame to do a low budget version of someone who could wind up on the big screen.
I imagine Taskmaster will make an appearance at some point in the show, though likely with a different costume. Hope they keep the skull mask.
There's a bunch of rogues who aren't likely to see the big screen for at least 3-5 years, if ever. Ultron, Gravitron, Whirlwind, Tiger Shark, that guy with the skinned face who fights Moon Knight....
And as long as they aren't killed, no one is going to care if the actors are switched if/when they make their movie debut. My guess is the only fatalities among the bad guys will be newly created villains.