UDK2015 was released the other day. There is a new blog post from Briand Richardson of Intel on usage of the UDK, and the main download page on the wiki has been updated to support it:
https://twitter.com/Intel_UEFI/status/652253984225394688
https://twitter.com/Intel_UEFI/status/652212808961138688
http://blogs.intel.com/evangelists/2015/10/08/using-udk2015-for-uefi-2-5-development/
