Some of our customers have been inquisitive about supporting high resolution displays, and I've had the mixed pleasure of getting a Dell U3415W display on my desk, supporting a resolution up to 3440 x 1440 pixels.
Using maximum resolution, navigating the map is rather jumpy, and doesn't perform very well with v10.2.7. On a normal resolution on a more traditional 24" monitor it is as smooth as one can expect.
This post is intended as a heads up, as this kind of display seems to be getting more popular these days. As this kind of resolution is absurd for most applications or websites I don't expect there to be too much demand, but figured I could give you some feedback in any case