With Assassins Creed Unity only at 720p on PS4, I doubt that's true. Looks like PS4 can't handle the number of simultaneous characters on screen that X1 can, and Ubi won't go the route of fogging in Paris to make it work. Also, as Azure becomes more available to developers, they will increasingly be drawn to the platform.
It's possible that indie developers will be the ones who go to PS4 in droves. It's an easy transition from PS3 and PS gamers mostly just support free or cheap gaames.