Them hbo guys noticed Matt Soell (gotta remember to include his surname now) sketching out his current projects on their forum. The list is appetizing:

I'm working on some stuff for the relaunch of bungie.com, doing preliminary work for the next FanFest, meeting with various folks about various Halo-related things (websites, merchandise, etc.), and doing some other stuff that's still a secret. :-)

Read the whole post here.