Sony, Microsoft and Nintendo starting the next gen soon, there is no doubt about that.
Only because PS4k is backwards compatible to PS4 doesn't mean it is not a new gen. XOne has some BC to X360, Wii U is BC to Wii. XOne2 will be BC to XOne.
Huh?
PS4K is "next gen" in the same way that New 3DS was a "next gen" handheld. As far as we know, everything that runs on PS4K also runs on PS4. That's not "backwards compatible", that's forward compatible - or rather, just a console revision.
The only company with a next-gen console on the horizon is Nintendo.