The good news: Halo 2 expansion coming soon.
The bad news: It's not going to address what we really want:
Call it Halo 2: Combat Expanded. After much speculation, Bungie today announced plans to release an expansion for its popular first-person shooter, Halo 2. It will not, however, contain a single-player portion that many hoped might wrap up Halo 2's abrupt campaign mode ending.
Basically, a pack of multiplayer maps. Which will be fun for the occasional Halo-day, but I'm not sure it'll be worth the $20 they're gonna charge.