Someone asked me about uefi support in the live iso.
Answer: No uefi support in the live isos I released.
I repacked the amd64 iso adding /boot and /efi folders from a solydx iso,
as described here -
http://refracta.freeforums.org/post5007.html#p5007
Also added current grub-efi debs to the offline folder.
It boots in virtualbox set to efi mode.
It's still experimental.
It's here -
http://distro.ibiblio.org/refracta/files/other/unofficial_live_devuan_beta_amd64_uefi_repack.iso
-fsr