While speaking with IGN, J. Michael Straczynski (Babylon 5) touched briefly on what the film will be about.
Here’s what JMS had to say about the film, of which he’s writing for Marvel Studios (story on that aspect here):
“It picks up right where the FF movie left off and it’s designed to answer the questions that were asked in the movie but really weren’t dealt with there, which [were]: Where did he come from, why did he become the Surfer and what is he doing here now?”
Source: IGN