Looks like the upcoming Freescale i.mx6 does. I would be shocked to find out that is the only ARM SoC to have PCI express.
imx6 appears to be a future product and there are no indications of how many PCIe lanes it has. The main problem with ARM and OS4 is that OS4 is a desktop oriented OS and ARM hardware is primarily mobile. If there are no readily available ARM desktop boards then an ARM port of OS4 is in no better position for the desktop than the current PPC boards. You will still have expensive custom boards that will only sell to a small customer base.
If OS4 is to switch architecture then x86 is currently the only viable option. The main problem is of course that Hyperion have very limited resources and a switch to any other architecture would probably be several years away even if all PPC development work stopped today.
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