Most people, including myself, have expected Apple to unveil a 4K-capable Cinema Display, but we're not quite there, yet. Well, now we have a tease thanks to Reddit, that Apple could be working on some 4K panels.
There are two panels, a 27-inch panel, and a bigger, 32-inch display. Both panels offer 3840x2160 resolution, and would use Thunderbolt 2 technology to drive the display past the usual 2560x1440 resolution of the current Apple Thunderbolt Display. The more exciting tease here is that could not use the 16:9 aspect ratio (which provides the 3840x2160 resolution) and push a little bit further for 16:10, which would push out a resolution of 4096x2160, or the "Cinema 4K" standard.