You are likely not going to get that until the Redmond software giant releases the operating system on September 30th. Microsoft is very conscious of the security of the Windows OS this time around.
This would seem to make sense - if the General Availability is going to be April 2015, it would make sense for it to RTM sometime in December 2014 or possibly January 2015. Windows 8 GA was October, but it hit RTM in August.