You have to remember that this game is going to throw hundreds (probably) of enemies at you at once. I'm pretty sure there is some bump mapping going on in those screens(it was in earlier screens), but I'd be surprised to see self shadowing make the cut.
Serious Sam is right up there with Doom on my list of favorite FPS games. I can't wait for this one! I loved the original. More than the semi-sequel on the Cube/PS2. Of course, I'm waiting for the Xbox version.
Serious Sam does rock. Excellent series. I would love to see this on the next generation of consoles. What I would love to see even more is a new Doom that plays like Serious Sam on the next generation of consoles. That would rock so hard.