I think his goal was to become the 'new' humanity. He mentions that humans need to evolve, and that's what he's doing. The point of creating the Vision body, with actual flesh (albeit bonded with vibranium) and a real organic brain (that Wanda can even read) is because he wants to become a real boy, furthering the Pinocchio theme. Once his artificial meteor hits and wipes out the current humans, he in his newly organic body would become the first of the new humans, which he views as far better. That's the whole reason it's called his 'vision'.I did catch that Stark said that he didn't know why Ultron was keeping the humanoid figure. I guess I just never combined that with the idea that he was seeking to emulate humanity just the writers acknowledging that for a great deal of tasks the human form isn't very efficient and that a variety of forms might have been better for fighting and what not. And yes the fact that Ultron was trying to emulate humanity probably is what was left on the cutting room floor but it does very little to justify how stupid the lips look or really save that part of the movie for me.
But again, this is mostly speculation of what I think was cut out.