The full changelist of the Arma 2 patch 1.62 can be checked out below:
– Multiplayer optimizations, security and server improvements
– Overall stability was improved with numerous tweaks and fixes
– Added new video options (Post-Process Anti-Aliasing, Alpha To Coverage)
– Additional AI improvements and numerous bug fixes
– Resolved issues with several training missions
– Added a lot of new script commands for content makers
Apparently this last “improvement” is directly aimed at mod makers, which is really a nice thing to do since it’s a way of saying “Thank You” to those who managed to make Arma 2 a lot more popular than it was (because you need the original game in order to play the mods)