My guess is that KONAMI will set the foundations on the PS3 as their initial plan was to use it on the PS4. However, they would use parts of the fox engine on to the PS3 so next year would mean a game with a new engine but that new engine would be restricted to what it can do on the PS3. I can see what you're saying about EA coming up with something better, but because the engine won't be used to its potential on the PS3, there could still be a big jump with Konami from PS3 to PS4.
Also, I think next year could be the year for Konami, not the PS4 era because many FIFA fans have converted to PES after this demo so when they play the demo this time next year, there will be a lot more which will close the PES and FIFA sales down as in 2011 when PES 2012 and FIFA 12 were released, FIFA only outsold PES 2.6:1. Also, the animation side to PES will be groundbreaking.
A very logical point. Though my "fear" as consumer who has absolutely no stake in it, is that even if about a 60% of the true potential of the Fox Engine is implemented into the franchise before the PS4 comes out, that Konami might end up destroying their franchise by making a mistake that cannot be repeated: using the analog as a 360 directional d-pad instead of how it should be used.
Konami needs to understand that the d-pad is just a dead horse way past his expiration date, the new engine, if implemented on the PS3, should not work around the same control scheme that PES has used for the last decade or so: the PS4 simulation games, will be based around analog control, d-pad control will be terminated.... Konami should know that by know.
If Konami implements the Fox Engine, and yet the control scheme remains the same old d-pad based system: direct analog without the assistance of any other button, and the ball carrier starts running through space, even though you are not pressing the "running" button or buttons..... Then that will truly be game over for Konami's franchise, because that would mean that the PS4 will be a repeat of what we've seen throughout the PS3's lifespan.
Konami comes out with fluid animations even better than the ones FIFA's offered so far (which honestly, is not saying much, considering the capacity of a PS3 console), but the control scheme, the execution of the entire game, still is based around the same old d-pad system, which means that the analog is in actual fact just a d-pad high on drugs, as is currently the case with both PES12 and FIFA12.
Then EA Sports, already confident and showing a bit of arrogance about it, comes up with a new engine which works around completely new controls, feels and looks superior in comparison to the outdated turd that PES would be, and there you have a repeat of the last five years.
So my point is, I'm actually in favor of implementing the Fox Engine as soon as possible, but I fear that in doing so, Konami might overlook the fact that implementing a new engine -at this very critical stage in the evolution of video games: moving from the extremely disappointing 360 degree d-pad which can be found on almost all PS3 games, to true analog control- should not only affect the look and feel of the game, but in this quite exceptional case, should completely change the way the controls work.
Of course, Konami's massive mistake during the PS3 era, was thinking that PES6, a video game which was designed around the eight directional d-pad, was close to perfection: satisfaction, narrow mindedness, was the crucial mistake. Hopefully, if the Fox Engine is implemented next year, I hope to see some fundamental changes made to the decade old control scheme, as that would signal that Konami is in good shape for the PS4. If not, well then, maybe the PES franchise won't be lucky enough to survive on extremely outdated games this time.