I just can't see Sony going balls out and producing a better piece of hardware when they are sitting pretty right now. Fracturing the user-base and creating mis-understanding among the casual's seems completely out of touch with their direction and market strategy. This type of release does not work on the consoles as consoles are historically targeted towards the casual market.
I could see a mild improvement in things like it being a 4K player, having a smaller footprint and "maybe" being able to upscale current games to 4K, but to say it will house a newer, stronger APU config, more memory etc, I'm having trouble with that. Sony had very strong developer relations when the PS4 was being built and with that, I'd doubt the devs would be on board with Sony insisting that they create a PS4 version, then on top, a better PS4K version. All multi-plat development already has to contend with PC & XBOX so another SKU in the mix would be too risky, expensive and time consuming for the devs, right?
Dunno...
They are competing with MS. If MS releases a new console this holiday and Sony doesn't they will lose the power advantage. MS will shout out the lungs how they have the most powerful console on the market and it would turn the tide in the console war. MS will get all the better looking multiplats and all the unprecedented partnerships. MS needs a new console more than anyone else atm. They are about to release QB at 720p in 2016.