Damn, people really start calling Mark Cerny a liar now?? And give more credit to supposed "leakers" than an actually engineer designing the hardware??
I get the feeling people forget that the engineering team of Cerny (and MS' engineering team as well for that matter) are working on next gen consoles since 4 years ago according to Cerny (MS most likely as well, although it could be 3 years ago because of the later launch of the One X).
It is literally their 8 hour/9-5/5 days a week job to evaluate manufacturing options, future technology use cases, possible implementations and possible graphical upgrades they can expect in the next years. And of course engineer their own designs, coolings solutions etc. They have possibly designed 10-12 different console configs with different weightings in terms of hardware allocation and evaluate all of that in regards to future pricing of components, long term visual benefits, speed, letting developers create what they want, own profits, future price reductions, future slim versions.
If they wanted to have hardware RT they could easily engineer it on their own and implement it in their own design. They don't have to wait for an official AMD hardware reveal for that...
There was also back in the PS4 launch day an interview with Cerny and AMD where they talked about GPU development. And AMD literally said that most people think that console makers just use off the shelf GPUs and then change the design to fit their own system, but that is in fact completely opposite: Usually the console makers hardware team set the basis for the mainstream GPUs and then AMD just cuts the special hardware/ custom designs and sells it to the mainstream.
