I'll check it out at the shops. Hope they let me play my USB stick.
What about media players? Or software for HTPC's?
Scaling to 4K is a bit heavy on processing without hardware acceleration. GPUs do it quite well (recent dedicated and integrated units). If you're looking for HDMI 2.0 support, current Nvidia units have it natively (current Intel units need a DP to HDMI dongle to get HDMI 2.0; this is also true for AMD except for the Carrizo APU). Fully-accelerated HEVC decode is another Nvidia GPU advantage at the moment (the only other x86 solution at the moment is the Carrizo APU).
While PCs can likely do better than most consumer devices when it comes to video scaling, it currently is in a disadvantage when it comes to native UHD content. UHD Blu-ray drives are yet to be seen.