Doubtful they'll release a turbo BRZ one year after the premier of the BRZ.
Where people are mounting their aftermarket turbo kits isn't really practical for mass production anyways.
Some of us really do not care for turbocharged plumbing. I'd try a separate, extra engine built for it. That sounds fun since it wouldn't be factory-built. However, I can't imagine the cluster**** that would become the turbo BRZ if it were actually made since the car is already heavier up front at 53% and it already drives phenomenally.
I think a bump to 250HP would be sufficient if they could keep it Naturally-Aspirated. However, it already breaks loose easily at 200HP (which it doesn't actually make to the wheels), so I'm not really sure where this thought of "needs more HP" comes from. I'd rather milk as much performance out of it as possible by making it lighter and taking away everything that restricts it to get it to 200WHP.
Summation: Turbocharged BRZ = More accidents and higher insurance. No thanks.