What is the max resolution output by the HDMI port of the MacBook Pro Retina? Does the MacBook Pro (Retina, Mid 2012) output 2560x1600 to the HDMI port?

The reason I ask is that I would like to drive 2x30 inch 2560x1600 monitors while still using the Gigabit Ethernet adapter. (My backup plan is to get the USB 2 to 100 Mbit adapter and use that and then just use the Thunderbolt for graphics). So I would appreciate any additional caveats to this plan as well.
If it's HDMI 1.4 as noted above, it should support "4k" resolution (4096×2160p24)

http://en.wikipedia.org/wiki/HDMI#Version_1.4