LG 31MU97 4K Display (4096 X 2160) Coming for Review
Good news: B&H Photo is sending an evaluation unit of the LG 31MU97-B 31-inch 4K display for review (due in mid/late Nov).
See Readers Inquire About LG 31MU97 31-inch 4K Display.
Update: canceling this because it is not properly supported by Macs.
Update 2: reader Rick M points me to an Apple page which now lists the display as supported. I have requested it from B&H for testing.