I didn’t see a mention of UHD on the 2.7 - 2.8 roadmap of Blender (http://code.blender.org/index.php/2013/06/blender-roadmap-2-7-2-8-and-beyond/)
or on plans for 2014-2015 (http://code.blender.org/index.php/2013/12/plans-for-2014-2015/).
With Blender you can already output pictures 4K size (3840 pixels wide by 2160 pixels) or 8K size (7680 pixels wide by 4320 pixels).
But as far as I know Blender is limited to 8 bits per color channel (the UHD norm is 12 bits), and there is no High Efficiency Video Coding (HEVC) output (nor 22.2 surround sound).
Is there a plan to integrate UHD requests in Blender ?