1. Real time lighting on models(both world and dynamic).
2. Huge client side optimizations that increase framerates.
3. UT style reward system(killing sprees, etc).
4. Tons of server enhancements, such as warmup periods, improved anti-camp, frag countdowns and much more.
5. Joust mode option(similar to Q3 excessive jousting).
6. Splash damage on plasma weapons, allowing for insane trick jumping, and faster rockets!
7. Security/anti-cheating improvements.
8. Much improved team joining mode, as well as an autoteam feature.