ZFSROOT UEFI boot

Hi, I need to get one of my machines converted over from bios GPT zfsroot
boot to efi. I know you can boot freebsd under EFI with a ufs kernel but
this isnt the route i want. There are patches under test for EFI zfs root.
However when I read the thread it was unclear which version of these
patches were needed and where to get them. Does anyone know where they are,
if there are any prebuilt zfsloader etc binaries, or if the patches have
made it to head yet?

Also does anyone have any pointers or good experience with grub efi and zfs
on root? I'm considering this option as it would make booting into specific
boot environments easier