According to a post over at Anandtech.com, it appears that Intel is working hard on a driver updated that will bring 4K display support for Ivy Bridge and it should be ready sometime in October.

In addition to the support for 4Kx2K resolution displays, the new driver will also bring hardware accelerated 4K video decode. Unfortunately, you will still need to use two DisplayPort outputs in case you want to get the 4K panel to power up from an Ivy Bridge platform, so most Ivy Bridge systems today are out of the question.

On a similar note, Haswell will support 4K displays running from single DisplayPort or HDMI.

You can check out more here.