It's taken longer than expected, but the Release Candidate for Mageia 5, one of the easiest-to-use GNU/linux distributions, is finally here!

http://www.mageia.org/5/ 

UEFI support – for real

“Mageia’s developers have been hard at work during this release cycle to add UEFI support to our installer, while the QA contributors were thoroughly testing everything that they could on their hardware. We are now proud to announce that you can install Mageia on UEFI systems fairly easily, using either our Live media or the classical installer (except from the DualDVD which does not support UEFI).”

Errata - Bug reports

http://blog.mageia.org/en/2015/04/26/all-things-come-to-those-who-wait/