By the way william Riker and william Decker and ilia and troi are too similar to just be a co-insidance.
There is some test footage of phase II on the second disc on the star trek I director's edition, don't know how much of the actual pilot was shot though I think only temp footage scripts and storyboards and audition tapes for Xon exist.
The future of trek would've been entirely different without spock, and the possibility of kirk being written off of the show with decker as the captain of the second five year mission would've been weird.