Unknown, My guess is, manual trans won't be available on the new Z or Supra and hydraulic steering, fogetaboutit.
That being said, my crystal ball has been wrong before and waiting 5 months like Tick mentioned, may be the thinking mans choice. But thinking men usually drive a Prius
The current Nismo will still be available in 5 months, so I'd set a time frame on making a decision then. No new solid info comes out, get the Nismo then.