Nope… I’ve no idea who he is either. He’s apparently in a US show called Friday Night Lights about American Football, which (being English) would explain why I haven’t seen it. ;)
Having said that, he does look right for the role (look at the pic above, i’d say they have that pretty spot on for Gambit!) He’s apparently signed for a 3 picture deal, so he’s either going to be a major player in any upcoming X-Men movies/spin-offs… or the studio is playing it safe and can keep him around if he’s popular.