eJay released a Singleplayer mission for ArmA2 in the BI forums.

Quote eJay :
The mission takes place in the northern Chernarus. Russian convoys carrying a lot of ammunition and weapons to the cities and airports. Your name is Joe Wright - a specialist in infiltration - and you need to get information on delivery dates and routes. Previous operations have failed. Therefore, your trip is quite fraught with risk. Do not get detected! Avoid the patrols and return to headquarters with valuable documents.

Features:

- intro
- voice acting
- selectable equipment via briefing
- custom music
- story-driven old fashioned stealth gameplay