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Well for a start, Intel would have to make an IGP that supports dual-link (resolutions over 2048x1536)

Because as of right now, none of them can

Haswell's iGPU will support 4K resolutions.

http://www.anandtech.com/show/6926/intel-iris-iris-pro-graph...

What is IGP?

For example HD4000 can drive a 2550x1440 display, but it doesn't work over DVI, only DisplayPort on the integrated mobos. I've never understood if that's related to a mobo limitation (that is just present on all Sandy Bridge mobos) or if the CPU can't pinout to Dual Link DVI but can to DisplayPort?

Computing wise DisplayPort looks a lot like an ethernet. DVI/HDMI has all kind of weird TV spec stuff that a computer display shouldn't really need to deal with.

The graphics output from the CPU is sent over Intel's own FDI (Flexible Display Interface), so the limitation lies in the PCH (chipset) that converts FDI to the various display interfaces.

I looked at one datasheet [0] for the 7-series chipsets and it didn't mention Dual Link DVI at all (although DVI was obviously mentioned). It did say "DisplayPort/HDMI/DVI 2560x1600 at 60Hz" in one of the tables, but your guess is as good as mine if that implies support for Dual Link DVI or not.

Edit: added link to referenced datasheet. See chapter 5.28.

[0] http://www.intel.com/content/dam/www/public/us/en/documents/...

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