Frozen Cliffs, Volcano, Temporal Research Lab...
I can't help but think these locations are going to be of importance if they do make a third game. I've tried to look at all the new content in the light that it was put in to either strengthen the connection to Chrono Cross (Lost Sanctum, Time's Eclipse, Dalton) or to add locations in that will play a role in Chrono Break (Frozen Cliffs, Volcano, Temporal Research Lab, possibly Eclipse Magus, Dalton).