I recently moved up to the world of G5 with the dual 2.3. Part of my excitement is that I now get to start learning Motion. Anywho...
In the manual it mentions a X850 video card, listed above, performance-wise, the 6800. So what would differentiate the X850 from the X800? Well in the case of the 9650, it has double the memory of the 9600 (256 vs. 128.)
So as a dedicated dual-display user, I'm hoping that we do see an Apple OEM X800 with a whopping 512 MB RAM. For the sake of Motion.
Just my random 2 cents.