Hock - pretty sure I read that S3 is almost finished and that it will air in the US this fall.....

And Dojj/Mike - the only thing we know about Sona so far is that a) the silent guy (or general as he was referred to in the last episode) wrote it on a bit of paper, and then when Micheal and the FBI dude got put in prison, the prison had SONA in it's title