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They've done that on every BMW with the integrated EMF parking brake starting with the F10. I'd imagine this saves weight and complexity compared to the E70/F15 electric parking brake system (central motor, cables, and drum in hat parking brake shoes). I don't see them going away from that, even with the M3/M5/M8. The F87 M2 is probably going to be the last BMW with a fixed rear caliper.
I don't see it affecting braking performance by having a floating rear caliper. Just look at the F90 or F10 M5. Those brakes are MASSIVE and those things stop on a dime, even with a relatively small rear EMF caliper. As long as the single piston size and rotor diameter is appropriate, they should be able to retain some really good braking performance.
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