I think we'll see a more powerful option soon enough, as it seems Toyota themselves are hinting at it. Doug Demuro said that according to the Toyota rep he was speaking to, a lot of the vents , etc. are designed to be accessible to be opened up by aftermarket companies....or....Toyota themselves.
I do think they should have designed their own interior, having it 98% BMW makes the shared platform seem much more like a re-badging effort.
Edit: BTW, I think the vents being closed is silly