About that rumor from last page about NX being one of the reasons of why the PS4K exists ...
i can't see that.
Sony has ... what ... 40 mio current userbase? Even if NX is more powerful than PS4 to a certain extent, it's not like that Sony would magically lose anything because of that. Also, i doubt that 3rds would put more effort in a port for a Nintendo console with an effective userbase of zero.
It's more likely that MS first started with hardware update plans and Sony reacted to them. MS would make people know if they have a new console with a huge power upgrade compared to PS4, Nintendo ... doubtful.
Of couse, that doesn't mean that it could not be more powerful or at least as powerful, i'd welcome it, just for the sake of 3rd parties, as Nintendo can make some good stuff even on a lower powered machine.
Dawn of the final week, right?