I just accidentally read this con report of the TERMINATOR SARAH CONNOR CHRONICLES panel, which unfortunately told me something I don't want to know. It's really quite vague...but it's a spoiler. Whatever. Given all the time travel on the show, I probably shouldn't worry about it. This other panel recap mentions that Lena Headey and Thomas Dekker "may be directing some of the show's online content going forward"...so, webisodes? Blogs? We shall see.
MahaloDaily.com's youtube channel seems to have the entire panel posted in five parts. Part one here.
Anyhow check out this great SDCC poster (via the TSCC official Wiki):
BTW, Fox recently announced official show wikis for FRINGE, HOUSE and 24 as well.