Unfortunately the video released at E3 is no longer available for download, but here are some screenshots I took from the video. Of course these are with the Quake II engine, so the final product may be different, but these show how the folks at 3dRealms were able to overcome the problems with outdoor environments that the Quake II engine had.
Our first look at one of the new enemies.
One of the buggers getting his guts blown out by Duke & his M16.
This bad guy can keep up with Duke's ride.
Duke can't even see this bad guy.
Duke takes a load off and hitches a ride on the freeway.
Check out the effect when you look towards the sun.
Close Encounters of the Duke Kind
A little anti-aircraft artillery.
You get to jump in this plane & blow the hanger doors open!
You can interact with characters in the environment.
Meet Bombshell, you're female companion.
Even more Bombshell.
Ok, this is the last one.
The stippers are back and better than ever.