On all the articles about rumours about PS4K, there are people ranting and hating on Sony, "for abandoning the early PS4 adopters". Sony have never even once (as far as I know) commented about the supposedly PS4K, for all we know, it could not even exist, and then there is people already (allegedly) selling their current PS4s. 

In my opinion, the PS4K, if it even exists, is just a regular PS4 equiped with a 4K Blu-ray player, so that a PS4(K) is the cheapest alternative when getting a 4K blu-ray player, just as PS3 was in the early years with the original blu-ray.

I'm wonder the same. We haven't heard a peep out of Sony, but everyone is running with it.

People like to jump to quick conclusions.

If we don't get a reveal about it between now and E3, it would likely be a suspiciously mounted effort to slow PS4 sales down. Doesn't appear to be working on that front.

Sony doesn't want to announce it just yet as sales might slow down. They'll likely announce it at E3 in which the release of the PS4K will be just a few months after, by then Sony will be ok with that.

"PS4 with double the power"

So from a R9 270 to a R9 280X?

It doenst really make sense from a marketing perspective, so i dont believe it, at least not until december 2017

Otherwise it would be a dumb move, especially in their position, why kill the hype ? It's not like the 3DS that needed a New 3DS because the sales were under expectations after some point.

I don't think it will have a 4K Bluray player, as that would cost too much.  Although the original PS3 did introduce everyone to Bluray, it was also $599.  Sony is not going to do that again.  PS4 Slim for $299 is a much better option.

Yes it will. No point in introducing a new PS4 if it doesn't play UHD blurays. Sony need a 4K bluray player on the market and the new PS4 is the perfect opportunity to do it. This the reason Sony still hasnt announced a 4k bluray player yet and they say it wont arrive until 2017 http://www.cnet.com/news/sony-4k-blu-ray-player-might-not-arrive-until-2017/

PS4K is apparently launching in Q1 2017.

I understand why you would think that, but to include a 4K Bluray player, Sony would have to raise the price to $599, or keep it at $399 but lose lots of money on each sale.  I think they learned their lesson from the PS3 and they won't do that.  They also don't have a competing format (HD-DVD) to go against, so I think there is less incentive to go all out like this.  If you look back at the beginning of this generation, Microsoft tried the media center angle, and that did no go well for them.

If you give gamers the choice of a $299 slim PS4, or a $399 or $499 PS4 with 4K Bluray, I think most would chose the cheaper model.