Just looked on the GSC forum, it was mentioned last week that a 3rd patch may be available in 2-3 weeks:-
http://www.gsc-game.com/index.php?t=community&s=forums&s_game_type=xr&thm_page=3&thm_id=5864&sec_id=12 (page 5).Here is the thread wilth the preliminary 3rd patch fix list

reliminary third patch change list. Subject to change.
AI
- Added avoiding dynamic obstacles for NPCs.
- Added enemy priority function – fixes incorrect NPC reaction on player’s attack.
- Changed the second part of the enemy search algorithm – having lost the player, the NPCs will no longer be baffled.
- Added correct reaction on shots and loud sounds coming from the player (only) on close distances.
Render
- Dual core optimization.
- 10-15% FPS increase.
Gameplay
- Added new game mode – freeplay; activated after the end of the game.
- Added the possibility for any character will be able to go to any smart-terrain.
- Fixed the ultra-intense vibration of the grass.
- All monsters drag now the corpses correctly.
Physics
- Fixed the situations when the physics get stuck in the floor or in the thin walls.
- Fixed the situations when the dead bodies disappear.
Network
- Reduced the traffic and lags.
General
- Fixed problems with OS Vista 64.
- Added saved games converter.
- Added MOD Tools support.