The only downside to this is the HD 4400 graphics unit. [1] I'm worried about it running everything smoothly at 2k. The HD 5000 is much better suited to run at that resolution.
My Samsung ATIV Book 9 Plus has a HD 4400 graphics unit and runs fine at 3200 x 1800, so you shouldn't have to worry unless you're doing something pretty graphically intensive.
After talking to people in the know, the reason they didn't upgrade to the Haswell with HD 5000 is they didn't want the increase in power related to having the extra graphics units.