User blog comment:ProfessorKilroy/Agents of SHIELD - First Look/@comment-3048593-20130523000229

By the time I'm writing this post, they've apparently cast someone to play Tony Masters (Taskmaster), at least on IMDB it says so.

Who does it say will play the role? This guy, best known from Walking Dead.

Don't get your hopes up though. I've only found this info from IMDB, so it may be completely false.