If you don't get any concrete details here you can do a little recon: Walk past the trailers and see what real and/or character names are on the doors - this is how I figured out which movie was doing some filming around Volunteer Park last spring (Traveling with Jennifer Aniston). You can search on character/actor names in imdb and find the movie info and it can often be confirmed with checking the "filming locations" link.
The same movie that shot in West Seattle on Wed. was in Ballard yesterday. Funny if they hopscotched between the 'hoods with community news sites .. in which case, look out Central District!