Some iPhone developers have downloaded the beta firmware and found out the new features come with this update:

  1. (For iPhone 3GS only) Now Video Editing gives you the option to trim your clip then “Save as copy…” rather then replacing the original video clip.
  2. (For iPhone 3GS only) Voice Control works over Bluetooth.
  3. iPhone now vibrates when arranging icons.
  4. Updated AT&T profile to 4.2
  5. The baseband version is updated to 5.08.01. This will fix the holes used by ultrasn0w and makes ultrasn0w fail to unlock iPhone 3G. So, don’t upgrade to iPhone 3.1 beta if you need to unlock iPhone 3G
  6. OpenGL and Quartz got improved. (For Developer)
  7. APIs to allow third party apps to access videos and edit them. (For Developer)