Well I recently acquired a Palm Pre Plus, GSM version. It was locked to AT&T, but not for very long :) Unfortunately, it only supports 3G on the 850/1900 MHz bands (mostly prevalent in the US/Canada) but is quad-band for 2G…
The differences between the Pre Plus and the Pre are few. The Pre Plus is missing the physical button in the gesture area below the screen, and instead operates just like the Palm Pixi Plus.
There’s also double the built-in storage (16GB) and RAM (512 MB) compared to the Pre. Build quality of the Pre Plus is improved – the slider exhibits none of the side-to-side play present on the Pre.
In this day and age of superphones, the screen feels a bit cramped, and the camera remains limited (mostly for lack of auto-focus), but the Pre Plus is still a surprisingly capable device despite being basically a year old design.