The manual only says
SD
SDHC
SDXC
Class 6 minimum for video recording.
It doesn't mention if the new UHS rate is covered. As the camera was first released over a year ago and UHS needs a new bus rate, I would guess it won't work.
Class 6 -10 will be more than enough anyway. I've got an 8Gb class 10 and it has enough space for 1000 of the largest sized images and records HD just fine.