Gears of War 2 Gameplay Footage

Important points from the video:
- The Locust have the ability to create a monstrous emergence hole that can sink cities
- The COG APC/Tanks are called "Derriks," and they tow "Grind Lifts," weapons that are going to be used against the Locust
- The lancer now has the reflex scope matching the original concept
- As reported, Destructible environments are present
- Lancer tracers have been altered to be every shot
- As I reported, we see huge amounts of Locust on the ground (battlefield)
- Use enemies as a Locust Shield (Human Shield)
- Chainsaw duels are done by smashing on the B (Red) button

Gametrailers.com has the video in High Definition and they have comparison videos comparing Gears 1 to Gears 2. Worth a view.

This one has a good slowdown of the details from the video with commentary: