They cast someone as Finnick (my favorite character)! Sam Clafin, he was in the last Pirates movie as the missionary guy that falls in love with the mermaid.
This is a picture of him:
I think he is an alright pick. He doesn't look quite how I pictured Finnick in the books but Josh Hutcherson didn't look the way I pictured Peeta and I ended up really liking him in that part.