I think the intention is to have the main sites (Hairbrained Schemes, Shadowrun Online, and Catlyst RPG) and then have them cross-post news and stuff to the Shadowrun.com site.
Basically, if there's any rumor, it's going to wind up on Shadowrun.com, which is nice, although I still search the dumpshock archives when I need an answer on rules and errata for SR4.
-kv