Cerny literally repeated the leaked specs posted in this thread. 45% faster GPU and 2-3x faster RT. He just left out the bit in the parenthesis where he said he saw some instances where it was up to 4x faster.
But if we are to assume that he was 100% correct about the 45% faster GPU, why arent we believing him on other things where the Pro does have some redeeming qualities?
We also had examples from the leaked docs where they literally said that a game that had one RT effect can now add two and run at 60 fps. All of this is in this thread.