- New features: FXAA Anti-Aliasing mode, user-definable memory allocators, new scripting commands, new commandline options
- Multiplayer is much smoother, no more warping, includes number of fixes, optimizations and improvements
- Netcode, VON and dedicated server fixes plus configuration additions in place
- Singleplayer received visual states smoothing and prediction (notable e.g. on distant units)
- AI is improved, especially (but not only) in combat, AI has received numerous bug fixes
- Aircraft & Helicopters simulation received slight improvements
- ARMA 2, ARMA 2: OA, ARMA 2: EW campaigns and stand-alone missions received special treatment to get rid of most from really annoying bugs
- official expansions & product combinations unified in way to allow easier operation of all distributions (separated installs/Steam/Desura) for build-in expansions manager
- Documentation to accompany these changes is available on our community wiki BIKI: http://community.bistudio.com/ and our BIForum http://forums.bistudio.com/
- ARMA 2: BAF and ARMA 2: PMC got their share of fixes too