> the 502 can be supplanted by a Radeon PCI video card (PCIe cards
> aren't supported yet).

In the A-Eon Q&A #3 on amigaworld.net 3 days ago the X1000 is said to come with an R700 family gfx card. That means that OS4 must support that card when the X1000 comes out. As the Sam460ex is supposed to be released after the X1000 an R700 family PCIe gfx card might be supported by the time the Sam460ex comes out.