I did some research on this. The fact that they keep calling their firmware EFI (without the U) bothers me since there is clearly a difference between UEFI and EFI.Boot ROM Version: MBP81.0047.B1E
After some research, I'm lead to believe that it's not possible to boot Windows through UEFI on a Mac because Mac's don't have the UEFI 2.0 standard and that Boot Camp assumes that any other OS aside from OSX should be booted via MBR/BIOS.
Interesting read btw:
I spoke to an Apple genius about it and he asked a tech person on the phone. Seems that UEFI isn't on Macs because the mac hardware does not conform to the UEFI standards, which were designed for PC's.
I did some research and apparently Apple dont even use standard EFI 1.x, its EFI 1.10 plus some UEFI 2.0 bits.
So we are stuck with BIOS under Boot Camp untill someone figures out a way to emulate UEFI in a rEFIt kind of way.