Live from Microsoft's E3 conference, Infinity Ward has just confirmed that Xbox 360 gamers will be first in line to enjoy the first two downloadable new map packs.

New gameplay footage has just emerged and will hit the net later today as will hands-on impressions from during the show this week.

Details up to this point have been scarce. This is what we know so far.

Features include:

* No co-op in story mode, but separate missions reminiscent of CoD4’s Mile High Club include cooperative multiplayer.

* In the wintery bits of the game, snowmobiles will be used to escape attack, but it’s unclear whether players will be driving or shooting from the vehicles. Ice walls can also be climbed by alternating between the two triggers.

* A live-patching system will be implemented for online multiplayer, forgoing the need for a downloadable patch.

* Game will run at 60 frames-per-second, with better detail than CoD4.

* Riot shields, movable turrets and customized weapons for single-player enemies were mentioned.

* Gameplay’s a bit more open-ended than CoD4 but is still linear.

* Stealth can now be used if you like.

* Infinity Ward’s working on fixing enemy respawn issues (CoD4’s enemies would constantly respawn unless a player crossed a certain line).

* The single-player campaign will be longer than it was in CoD4.