We are in the midst of evaluating some 4k displays at work. Current input standards for these displays are as follows:

1x HDMI 1.4a input - UHD (3840 x 2160) @ 23.98/24/25/29.97/30Hz
4x HDMI 1.3 input - UHD (3840 x 2160) @ 50/60H

We're using the term UHD at work as these are not true 4k displays (in the Cinema world 4k is 4096 � 2160).

Color space and color depth are also issues, but most of the current displays are Rec. 709 (HDTV).

Meridian Advocate