Re: No Thor 2 for Kenneth Branagh...
I don't see why a lot of people are complaining about Don Payne coming back for another round. It'll be pretty obvious once he's finished and do some rewrites for the new director, Disney and Marvel will bring in another writing team (possibly Stentz and Miller again).
I'm sure Marvel and Disney will get a capable director. They'll probably dip into the well of directors they've worked with before first. If Avengers takes off next year, I'd be stoked if Joss Whedon got the gig.