Seeing as races 2 and 3 are held on tracks located in the Americas and Europe respectively, it seems fair to guess that the new track for race 1 would represent the Asian-Oceanian finalists. Could be Shanghai, could be Motegi, could be something else perhaps. Personally I'd have gone for Autopolis as it's a great Super GT track which has seen no representation in GT yet, suitable for anything from Gr.1 to the slower N-classes.
Or perhaps PD will hit us with the greatest troll move of all time by introducing Spa Nishiura
located in Aichi, Japan.