Presuming you mean 4x 2560x1440 there, you can have close enough to that pixel count today; one of the things Dell released at CES this year was a 52" 6144x2560 display (U5226KW).

Since it's intended to be a monitor, you get a USB hub, DisplayPort, Thunderbolt, and other things you wouldn't get on a TV, too.

I've been looking at it longingly, but I can't quite justify that pricetag right now.