Originally posted by Fate
Well some of the new features (for the iPhone anyways) are
1. Better battery life
2. Better Performance (of some apps crashing)
3. Your lockscreen won't show up anymore when you power it down. (using the Slide to power down, and when the circle appears, your Lock Screen will re-appear)
4. Camera Improvement (for both iPhone and iPad)
5. And Signal Improvement for 3G (iPhone + iPad)