Gizmodo has some information on the Treo 650 update. So does Engadget. Pretty much sounds like the rumoured additions will come to be: dedicated answer/disconnect buttons, voice recording, bluetooth, higher res screen (320×320), higher res camera (1.3MP), backlit keyboard, removeable battery, and video-mode on the camera.

Here is a photo with the screen turned on and the backlit keyboard lit up.