WGT has a long term agreement with the USGA to add US Open venues.
Plus WGT has to reach and pay for a use licensing agreement with any course they want to add.
In the next 13 months we will be getting 4 new stroke play courses:
2014 US Open venue Pinehurst #2 in just a week or 2.
In progress is Bandon Dunes Resort - a par 3 18-hole course (select par 3s from their many golf courses)
Pebble Beach Golf Links for 18-hole stroke play. The necessary photography (200,000 to 300,000 photos) has been scheduled.
Then we will get the 2015 US Open venue Chambers Bay next May.
It takes WGT about 6 months to do the work it takes to add a new 18 hole course. So they are pretty much booked up until May of next year.