I think the X1900 is quite unlikely. My guess is they will stay with the X1600 (or maybe something in the X1800 family). Afterall, it is a -consumer- machine and Apple always seems to be a few generations behind the latest in graphics chips.
I think it would be wuite good to see some Nvidia cards, they could quite easily put in a 7600GTX/7800GT, that would give the graphics capabilities quite a boost...
I think the X1900 is quite unlikely. My guess is they will stay with the X1600 (or maybe something in the X1800 family). Afterall, it is a -consumer- machine and Apple always seems to be a few generations behind the latest in graphics chips.
a X1800 mobile doesn't seem unlikely, after all, the iMac is a friggin desktop, sometimes I think Apple may be sacrificing much making the iMac like that, its like a friggin ultra heavy portable computer, space doesn't matter for desktops.