there is so much more imgage quality to be gained at current resolutions just by doing it right that I don't see 4K as all that important until you start having typical sizes around 90" inches or greater of screen.
We are only talking about some "enhanced" BD format. Television is ages away from 4K in the states.
Below is a list with TV using a PC on my 82"
Video quality is in order of worst to best. The problem has always been the PC is a real monster to get the video right. So maybe if Ivy Bridge gets it video on par with or better than good CE devices maybe.. but the drivers just don't produce top notch quality video easily. You need something like madVR which is extremely limited and it is band aid on gaping sore that few here admit. Before you attack me read the current thread on calibrating a TV with an HTPC as source. The experts will admit the PC is a bitch to get close, but it is compromised at best.
Worst to best:
1 WMC MS decoder or decoder of your choice Suxs!
2 ATSC with MadVR in J River Media Center much better than WMC through it filter chain. Sadly no Digital Cable and J River has a pretty sorry TV interface out of the box.
3 WMC ATSC and or Digital Cable via HP MediaSmart Windows Extender. This looks very good btw. Very good!
4 Sage TV - Using a Sage HD 300 going through my DUO with the Sage Extender at native resolutions. If you haven't seen a Sage HD 300 sending native resoltuions through a good VP.. you don't really know what PC sourced video can look like.. Sadly sage is no more, although it looks like the extender hardware will have a second life as the next gen POP box. Probably won't output native resolutions and no live tv in any case.
Most displays still leave a good bit to be desired.
I vote for better displays (bigger, better picture, lower cost) before 4K. And PCs do not bring out the best in displays. I love the integration of a PC but they aren't state of the art when it comes to image quality. Fix it the current resolutions on a PC then I will care about 4k, maybe.
Samsung 78" JS8600, Mits WD-92840 43" Samsung 43ku7000 - Lumagen Radiance XS, Martin Logan Motion 40s, Ascend Sierra 2s
58" Panny Plasma -DVDO DUO, Usher S520, JBL HLS-610, Definitive SM45, MusicHall Marimba