Will Clifton Collins Jr. stand with or against Thor?

The actor posted two messages in the last 24 hours about the film, via Twitter. First, “Studying my ass off for THOR, gonna be a late night, well worth the loss of sleep!” then “…hitting THOR hard this mornin!” Suggests there’s an audition today for Branagh’s picture. But for what role? I’m not going to assume that Collins doesn’t take his work seriously, but if he’s really got to research the role there’s the implication that it’s more sizable than some run of the mill antagonist. But he’s not exactly the Asgardian type, right?