From Xfce 4.12 tour:
Window tiling mode was improved by providing support for corner-tiling
This little addition might just be enough to make XFCE 4K-friendly.
By tiling a Full HD window on each corner of the screen, one can work as having four Full HD monitors.
With window searching reduced to a fourth of what it used to be, time savings for professional uses are massive.
Loving to see those 4K TVs dropping price in the last year.
The pressure for cheaper HiDPI displays will continue over 2016 thanks to mobile.
That will make 4K monitors affordable for most freelancers and companies by 2017.