Steve is right on the money and was correct in agreeing with my initial assessment.
There won't be a GT7. Not gonna happen. The Gran Turismo series is a dinosaur and now they're jumping the shark, hoping to catch lightning in a bottle one last time. To be honest, I question if we'll see GT6. Actually, I've been wondering about that for a while.
They saw an opportunity with the new Corvette. And realize, it's not just a new model year Corvette, it's a new freaking generation of Corvette. The car has been around for 60 years, and to date, there have only been 6 previous generations...this is big in the car world. PD has jumped on GM's coat tails to help push their dying product.