Alexander Skarsgård, son of Stellan Skarsgård and recently seen in Generation Kill and True Blood, is rumored to be in talks to star in Kenneth Branagh's Thor. Apparently a sharp-eyed tip-person at Latino Review saw the actor and director (canoodling?) at a restaurant together, and later LR was somehow able to confirm Branagh had dined there at that time, hinting that the two might be discussing a collaboration.
What can I say that his being Nordic, 6'4", and long blonde-haired hasn't already? You aren't going to find anyone else who gives more of an irrepressible Adventures in Babysitting moment than this guy. Hypothetical casting: approved.