it seems like 24 and 30 refers to bits per color and journalist confuse that with fps. New Displayport standard is capable of 3840x2160x30bppx60fps
and it would be suicidal for hdmi not to match that muchhttp://www.mtbs3d.com/phpbb/viewtopic.php?f=2&t=2221
Few key points:
•multiple independent video streams
•doubling of the effective bandwidth to 17.3 Gbit/s
•AUX channel bandwidth increases to host bi-drectional USB
In summary, DP 1.2 is able to host
a.two (L-R) 2560x1600 60 Hz video streams (or a single 1600p120 stream) at 30 bpp color;
b.one 3840x2160 60 Hz 30 bpp stream, or
c.four 1920x1600 60 Hz or 1080p60 streams at 24 bpp , etc.
over a single cable.