Detroit added to the schedule albeit for just GT(A), Cup and GTS won't be there. 2 races as usual.
This brings the total number of events for GT up to 11. GT Cup has 10 events scheduled right now, GTS 9 and the TC classes just 5 (but with 1 TBA - perhaps at New Jersey MSP with Trans-Am).
http://www.racer.com/pwc/item/110517...-2015-schedule
http://www.racer.com/pwc/item/109945...-2015-schedule
On 2 events (COTA and Miller) PWC will be joined by the Pirelli (Porsche) GT3 Cup Trophy USA (not the same as IMSA's GT3 Cup), see
http://www.racer.com/component/flexi...y-usa-schedule