According to Subaru, they are looking to expand the STI-line up and one of the models that fans think should be getting the STi badge is the Subaru BRZ model. If that is the case, we might already have the answers as to how the Subaru BRZ STi will look like when it arrives.
We know that the standard Subaru BRZ model will be coming in with a new exterior design that is based on the Subaru Impreza. If that is true, that could also mean that the Subaru BRZ STi will be coming in with a new design that is based on the Subaru WRX STi model.
There were also talk about the Subaru BRZ possibly coming with a turbo engine in the near future but Subaru has already shot down that rumor.
As of now, nobody really knows if there is going to be a Subaru BRZ STi model or not so all we can do now is wait and see.