Codemasters have sent wordover that the first piece of additional download content for Operation Flashpoint: Dragon Rising will be hitting PC and Xbox 360 tomorrow while the PlayStation 3 will be "shortly".
The additional DLC titled the Skirmish pack and will let players go head to head in attack helicopters, deploying tanks and APCs and engaging in ranged and close quarters combat in a set of new maps and missions.
Four new maps are included and two new Fire Team Engagement missions which you'll be happy to know fully support co-op as well.
A new patch will also be released for each version, you can find the patch notes for the PC here, and the console patch notes here.
The new DLC will cost you 400 MS Points on Xbox Live and $3.99/£3.19 on the PlayStation Network, it is however free on the PC.