Planar showed an 84-inch UHD set available in a variety of configurations: a straight display, a somewhat brighter straight display, a display with a writable surface (shown here) and more. It can also show four standard HD programs at the same time in opposing quadrants of the screen. Pricing was a little confusing, but plan on at least $20,000 and up, depending on the version you choose.
Planar is the company that bought out Runco a few years back, but if they are still making projectors they weren't showing them this year. The passing of Runco as a distinct entity is notable in the annals of CEDIA EXPO. That company nearly always had one of the largest booths at the show.
In scoping out the Wisdom Audio demo (discussed elsewhere here) I noted that it was using a 3-chip Runco DLP projector. Under Planar, Runco projectors are indeed still available.