The most recent (Aug 17) distro is Linaro Precise 12.08 with your typical USB driver offerings... thus...

root@linaro-ubuntu-desktop:~# more /sys/bus/usb/devices/usb1/product
S5P EHCI Host Controller
root@linaro-ubuntu-desktop:~# more /sys/bus/usb/devices/usb2/product
EXYNOS OHCI Host Controller

but I will see if I can find out what the USB max speeds are; the ODROID-X has the same smsc chipset that the Pandaboard has for the network / USB stack combo...