Okay, here are my findings on Z68X-UD3H-B3-r1.3 and the U1E bios for it:
The backup bios is flashed over by flashefi.exe, the flashing procedure can be seen repeated twice, and the rescue procedure with the power button and and switch confirm that, restoring from backup also gives the uefi one, there is no way back it seems. (edit: did not know about the ctrl/alt f10 but suppose those are the keys now?)
Everything seems to be there, except the vcore and llc settings, the mem section is extended with some parameters that are new to me and where not there in the award bios. The autopilot of the mem section seems to do a better job than before, at first I could not run 2133 w everyting at auto, now it gave me c9-13-13-36,1t and passed memtest too at that setting.
Non of the gigabyte apps will install anymore, it's either 'not a gigabyte board' or 'chipset not supported' when running the ap. ET6 (preinstalled) was working, but without the vcore so I decicded to try and upgrade, after removing the current one the new one would not install anymore.
SLI is not working, have the two cards in, but no way to set them to SLI from windows, reinstalled the drivers ofcourse, but still no luck, could not find settings in bios for it either.
Setting all the multi's in the advanced section does not work like it used to, seems it only reacts to the main multiplier setting.
I'm at 4ghz/2133 not bad at all, but the lack of vcore and sli is holding me back a bit, but I suppose these are in the works, and will work in later updates. It's a pitty the gigabyte soft and other soft like aida stopped working, but it seems these are mainly detection issues that can be fixed by updated apps. (edit: hwinfo64 is working)
All in all it's a refreshing update to me, but I'm hoping the vcore and sli will be fixed soon.
edit: some images
http://imgur.com/0asN8http://imgur.com/GJZolhttp://imgur.com/lIRhKhttp://imgur.com/Xt0yyhttp://imgur.com/AnRsk