I'm blessed to have a Dell Precision 5510 laptop with a 4K display.http://www.dell.com/us/business/p/precision-m5510-workstation/pd
but I think soon enough many more corporate and personal laptops will have such screens. Things get tricky in non-Windows OSs though, especially if the resolution or font sizes can't be manually adjusted to compensate.
When booting from a recovery USB drive created by Veeam Agent, the rendering of fonts, and the window sizes, have been greatly improved since VEB 1.5, but there are still some rough edges, with some screens pretty much illegible.
Just hoping this report helps for future releases, although I realize it's likely a low priority thing. Loving the other little tweaks and backup options, heavy testing underway...