To sum it up:
- *NEW* Release estimate: Holiday 2006*
- Gravity gun will get new functionality
- Vortigaunts will be more fleshed out
- More details about GMan will be revealed
- New vehicle will be introduced
- You will cover the same amount of locales as in hl2 and the new locales will have a much more realistic feel to them since they are based off real locations
- We'll see the UBER and most difficult physics puzzle to date in episode 2
- New weapon known as Strider buster
- Strider and Hunter now has a weak spot *could change*
-Big battlefield-esque combat engagements with lots of enemies and allies fighting. Woods provide plenty of cover
- new yet-to-be-announced multiplayer game will ship with episode two...might it be TF2 set during the 7 Hour War?
http://forums.steampowered.com/forums/showthread.php?s=&threadid=450477