My sources on Toyota's engineering team confirmed today that the new Toyota MR2 would use the same basic platform as another well rounded enthusiast car, the Hyundai Veloster. The MR2 will reuse Hyundai's engine and suspension. Both N/A and Turbo options will be available.
I spoke with an anonymous Toyota engineer last week to iron out some of the details on the new car.
Also check out this video on the new Supra.