[JonnydaJibba]

So far there are a few. But they didn't include all the new weapons that will be in the final game.

There is a giant one hit kill laser cannon, some weird alien machine gun much like the SMG, the original assault rifle, some other giant missle lauching cannon and grenades that stick to people and also walls and stuff. They aren't the plasmas, but aren't really that different from what I can tell. Most of the existing weapons have been tweaked. The Needler is a lot more useful now and the plasma pistol is more powerful. Most of the weapon sounds have also been redone. There are some neat doohickies like the bubble shield, a portable grav lift (think this plus oncoming Warthog = amazing feats), a landmine thingy and some other thing that drains energy and kills you.

I'm probably leaving out other stuff but I can't think of it at the moment.

Oh yeah you can rip turrets off their stands. Yeah they tear shit up.