Arnold Schwarzenegger just posted to Facebook This Great Awesomeness
From what I see in the Terminator Genisys web page, this appears top be a countdown to a preview release of Terminator Genisys movie that will be released in 2015
at the bottom of the page you see “This film not yet rated”
Other than those details, you could suspect the countdown could only be to the preview of a video game. but below that is the legal rights to paramount, and not one of the video game companies.