Bungie very close from releasing Halo 2 Expansion Pack.

http://bungie.net/News/TopStory.aspx?story=weeklywhatsmar18&p=2645901

The Expansion Pack is rumored to cost around $19.99, however, those on xbox live can download it for free.

The pack will include nine new maps and many fixes for the glitches in the game, for example:

1. Split Screen Enhancement

The Autoupdate removes trivial pop-up messages (like ammo pick up, for example) that have cluttered split screens. Important messages will continue to display as before.

2. Geometry Glitches

Fixes for Flag Bouncing (in colossus) , and Grab Through Wall for flag/bomb/skill in many maps.

3. Cheat Bug Fixes

Fixes for Elite Hog Ghosting Trick, Sword Flying (from hog or using rocket/sniper), Ghost Dropped Weapon, Teleport-Pinging on Beaver Creek, Shooting Broken Turrets, and finally Red Team will no longer get a win in case of tie.

4. Clan Matches

Easier to match even when conditions are less than ideal.

5. Standby Fix

Several fixes to help alleviate this problem and make it less worthwhile to cheaters.