DualShock 4 patent that had buttons on the grip & buttons under the d-pad & shape buttons.
And another design that would have had the analog sticks above the buttons
301 seems to be the DS4 that we ended up with.
Edit: there also was going to be LEDs around the face buttons. (must have been the Buzz devs idea)
I think I know where Sony was headed with the buttons inside of the grip of the DS4 prototype.