Been doing some monitor shopping...might just have to wait for this one. Coming out in April.
ThinkVision Pro2840m
3840 x 2160 pixels (157 PPI).
true 10-bit color
DP+mDP_MHL
USB BC 1.2
3x USB 3.0 and 2x USB 2.0
http://reviews.cnet.com/lcd-monitors/lenovo-thinkvision-pro2840m-4k/4505-3174_7-35833678.html
http://www.tomshardware.com/news/lenovo-4k-monitor,25566.html
ThinkVision Pro2840m
3840 x 2160 pixels (157 PPI).
true 10-bit color
DP+mDP_MHL
USB BC 1.2
3x USB 3.0 and 2x USB 2.0
http://reviews.cnet.com/lcd-monitors/lenovo-thinkvision-pro2840m-4k/4505-3174_7-35833678.html
http://www.tomshardware.com/news/lenovo-4k-monitor,25566.html