About the VISA - yes, I'm so bored that the VISA thing is the most interesting thing I can post, mainly because I hope he'll drop out of this film - a couple of posters at CB wrote this:

"a US work visa, an O/1 you need to go for an interview at the US embassy. They're initially issued for 3 yrs then need to be renewed annually."

"He probably had the P-2 like Dan Radcliffe, project-to-project, and is getting it bumped up,"

Which makes me think that the new VISA or a renewal of an existing one isn't necessarily linked to Kong filming.