As stoked as everyone who attended E3 was about the new Halo demonstration movie, there has been some unrest in the community over the wait until it's released to the general public.
In response to a request for some tidbits to tide us over til then, Bungie's Matt Soell had this to say in a post on the Halo.bungie.org forum:
I don't know what, if anything, is going to be released in the next few months. I'll try to find out. Regarding screenshots, I'm already trying. :-)
So even if we do have to wait until later this summer for the movie, it looks like hopefully we'll at least get a few more screenshots from the new build.