In an interview with Gizmodo's io9, Marvel Studios' president Kevin Feige stated some real stuff about prequel and the making of it.
He also added that few elements will be completely different and better for sure. “There’s a method to the madness,” said Feige. “There’s always a method and doing things in an unexpected way is something we find fun. There are ways to do prequels that are less informative or answer questions you didn’t necessarily have, and then there are ways to do prequels where you learn all sorts of things you never knew before.”