Weren't these exact specs going through the console gaming news cycle some 2-3 months ago? I believe this is the OFA: http://www.giantbomb.com/artic...
But yes, this makes a lot of sense for Sony. It is not going to be technologically feasible to release a gaming system with at least 10x more GPU power than the original PS4 within the foreseeable future. Certainly not at a reasonable price point. It is feasible to do a 2x upgrade next year because the PS4 was somewhat underpowered to begin with. Then there could easily be another 2x upgrade sometime in the early 2020's.
(Yes, we are less than three and a half years away from the early 2020's. Sounds a little implausible, doesn't it?)
I think the PS4 series of consoles is likely to be Sony's final non-portable gaming system. One of Nvidia, Intel and AMD will probably be the company that pioneers the truly next generation of gaming consoles, which will require truly radical change in how GPU:s are made.