http://www.xilinx.com/support/answers/63635.html

The Vivado 2014.4 tool update (2014.4.1) addresses the following issues:

Delivers critical UltraScale package updates
Production Kintex UltraScale XCKU040 support
Production speed file updates for KU040 -1 and -2
(Xilinx Answer 63088) - Vivado Device Programmer VU440 Direct Configuration support
IP GT Wizard production support of GTH for KU040

Note: This update is only required for users targeting UltraScale devices.

The download file for this update is approximately 1.12 GB.

It must be applied to an existing 2014.4 installation and will bring the Vivado version to 2014.4.1.