A full list of current changes in the upcoming Version 3.0 of SvenCo-op has been posted on http://www.svencoop.com/. The list includes only changes made since the last public release, and does not include features that are still in development, so there'll be a few more before 3.0 ships... there are currently well over 100 items, however. A large percentage of these features have not been previously disclosed.

Features
- Opposing Force Grunts added, including Torch (explodes when fuel canisters damaged), Medic (heals players and allied humans), SAW, and Normal grunt types. Friendly and Hostile versions of each type are available.
- Shock Trooper Spore Grenade added
- Added Black Ops Osprey Helicopter
- New entity: env_spritetrain
- Free Roaming option for mappers - Monsters can roam a level that has info_nodes
- Friendly monsters can follow players with the +USE key
- Blood effects are now clientside
...
AI/Monster Changes

- Monsters now target the Osprey Helicopter at either one of its engines.
- Monsters now duck and cover from Rockets.
- Human grunts can use/abandon controllable turrets (func_tanks) of their own volition, as necessary
- Monsters will now attack enemy barnacles that have prey
- Fixed issue with Sniping Male Assassins reloading if schedule failed
...

more on their website