The next version of Assassin's Creed will be called "Black Flag".
There was a confusion that Golden Age will be the new title for upcoming Assassin's Creed series but the Ubisoft people recently confirmed that it will not be the name.
“Before we officially announce a game to the world, we use a working title or code name to refer to a project internally," the representative said. "Assassin's Creed Golden Age was the internal name given to Assassin's Creed IV Black Flag. It is not the name of any future Assassin’s Creed title."
This is what the Ubisoft people said a few days ago. The name is still yet to be announced. The work has a lot to be done.
We will update you once we get more news on this issue.