Josh's role in the movie is something I'm still getting details on, but his name will be "Randall".
Thanks to aussiechic for sending me some links, there will be websites that are archiving footage of the daily filming process. There is also an official site that has been opening to get extras, too.
Battle in Seattle official site
Movieset.com - Video footage and daily accounts of the film
Thanks for the thread, kat!