I’m pretty sure the Z1’s graphics will be updated in the next major revision. I don’t know if it will be something like ATI Mobile 9600 level but it’s sure to be upgraded. Perhaps they’ll upgrade it to a model that supports 32 or 64MB of memory.
Of course, Ideally, they’d put in an ATI Mobile 9600 with 128MB but Sony doesn’t usually do that in their thin and lights.