What is the intended plan with this basement rough-in plumbing?
I think Jack is right--here looks to only be one water line so that maroon would be for the toilet. I would expect the vent to be in the wall, and the 1-1/2" or 2” pvc to be a sink drain. The toilet was probably planned to be at a 45 degree angle. 

A sink requires a outlet within 36” so that electrical may be for that once the studs have been installed on the stem wall. With only one water line an on-demand or small water heater may have been the plan.