Take this one with a grain of salt, but it seems like Thor might be sending out it's first casting call. Over at Auditions-Auditions.com, a casting call has been posted for Thor, to be directed by Matthew Vaughn.
The description of the film on the site says:
Partially disabled medical student Dr. Donald Blake discovers his heretofore unknown alter ego, the Norse warrior, Thor.
The description matches, but one has to wonder why the film isn't being listed under a code-name. On the other hand, with Marvel signing a deal with the WGA, it seems possible that production on Thor may have resumed.
According to the casting call, they are looking for males and females of any race, between the ages of 18 and 60 for the film.