It’s going to be an evil vision for sure, I really hope spader is back as the voice and they leave it ambiguous whether he is Ultron or not.
He won’t be as powerful as vision or ultron as both were created by the mind stone rather than created by someone who was created by the mind stone.
I think how this ends is pretty obvious. I have no for knowledge but have put my speculation in spoilers
I doubt we find out anymore about where Fietro came from. They will leave it ambiguous to be ret conned later for dr strange or future x men