Photos of a upcoming new Palm One Treo 650 (formerly 610) model have surfaced in the Discussion board on TreoCentral. The Treo 650 is the follow-on model to the Treo 600, which is currently on the market.
User WeebitObsessed posted several photos of the Treo 650 in this threads (page 1, page 2).
WeebitObsessed also writes that the new Treo 650 will have bluetooth, higher screen resolution, new keyboard backlight, voice-recorder and 1.3MP Digital Camera. All former Treo Accessories are supposed not to work.