Poor quality replies to the OP so here goes.
My understanding is that you would either need 2 x 1.2 DP cables which would bind using MST or drive such a screen (4k@120hz) using USB3-C (such as the Dell). You might need a spanking new Skylake board with the correct support to drive it using the latter. I think its going to be the latter recommended for the new Dell screen for ease of use. You will still need 2 x 1.2 DP cables from the USB3 breakout box or, a single DP 1.3 cable (coming soon). Looks like you just need a USB3.1C class cable to go into the monitor (supports up to 8k 60hz on single cable). Looks like the 5k screen from dell which is already out uses 2 x 1.2 DP cables bound in MST.
4K @ 144hz would also be supported by the cabling. I do not recall any screen being announced for 4k@144hz yet.
Type of monitor used would be either the Dell UP3017Q or similar (4k@120hz). I believe this panel is imminent onto the market (original USA release date was 31st March).
If it is the Dell then this is an OLED monitor so the benefits are self explanatory, even if the screen cannot be driven at 120fps at all times in gaming, it will still have practical applications outside of gaming (4000:1 actual contrast ratio vs 1000:1 for a good IPS panel).
You may not be able to drive AAA titles at 120fps however there would be lots of games that would break the 60fps barrier, especially if you are willing to play with detail settings.
I would expect something like Ori and the blind forest would look incredible on such a screen.
I would also expect input latency to be near CRT levels unless Dell needed to strap a load of processing circuitry to the OLED to enhance motion resolution. In terms of G2G response time, it looks like the Dell is rated for 0.1 MS (!).
I await the TFTCentral review with baited breath.
