There goes all hopes of Jan 3rd release.Surprised I made it this far in the thread without someone mentioning it (unless I missed it). The build is not tagged as a release candidate. Release x 64 simply means that it was compiled targeting 64 bit architecture, and with optimizations enabled. The alternative being Debug x 64 which builds debug symbols / information that makes it easier to debug issues.
Every single PTR build will be Release x 64 and it has nothing to do with being a release candidate or not. It's just the target configuration from Visual Studio. Nothing more.