Good luck trying to jailbreak. The Surface RT has UEFI secure boot permanently enabled, meaning the device will only boot an OS or run drivers signed with Microsoft's platform key.
On OEM x86 machines running Windows 8, Microsoft backpedaled and allowed OEMs the option to not enable secure boot, users to disable secure boot, and users to upload their own PK. Because the Surface is not built by an OEM and the hardware is controlled by MS, they didn't need to allow this, so they locked it down. This restriction is also why you can't side-load programs - they have to be signed by MS, so they can only come through their app store.