Time will tell, the company won't.
The only reliable information available is that each year a full US Open course is planned be added.
This would be
2015 Chambers Bay, University Place, Washington
2016 (OAK) - replacement?
2017 Erin Hills, Erin, Wisconsin
2018 Shinnecock Hills, New York
2019 Pebble Beach, California
Launching Pebble in advance (e.g.2016) would only pose a new problem in 2019 (if anybody thinks this far).
Daydreaming, I think of the Open Championship courses of the upcoming years:
2014 Royal Liverpool, Hoylake, England
2015 (STA)
2016 Royal Troon, Ayrshire, Scotland
Hoylake and Troon would be big fun for sure!