1. There must be some truth to these rumours about an upgraded PS4 coming out. If there was no truth to it at all, SONY would have been forced to publically object to the rumours.
2. While it may be called "PS4k", gaming in native 4k resolution is probably not the actual focus of this upgraded model. Instead, the main rationale behind the CPU/GPU upgrades is probably VR gaming: Unlike usual games, the images in VR games must be rendered twice, for the left and the right eye, so producing the same graphics quality as a usual (=non-VR) game in a VR-game probably requires about twice as much processing power. So the talk about "twice as powerful" makes perfect sense if it's really about VR; especially since the PS4 CPU/GPU is usually considered good enough for games, but not quite good enough for good VR graphics. And while this upgraded model may be technically capable of 4k resolution as well, 4k resolution will probably be more relevant for media streaming than for gaming.
3. The only thing I find strange however is that SONY apparently didn't prevent the rumours spreading already. As I get it, it's still almost a year until this new model will arrive. But who will buy a PS4 now, knowing that in just a few months there will be an upgraded model about twice as powerful? The rumours should at least slightly affect PS4 sales.
4. There's no need to worry that people owning the existant "classical" PS4 will soon suffer from inferior graphics because the devs will now focus on PS4.5 hardware. There are already 40 million PS4 out there, it would take many years before PS4.5 comes even close to that numbers.
