I think if they were going to jump to a new version like that they would have done it already at this point, since there’s the new consoles coming. But since they’ve added support for the new consoles to UE4 it doesn’t look like that’s something that would be necessary. The main reason they made UE4 was that they needed to build something that wasn’t reliant on third party code so that they could freely distribute the source the way they wanted. They can continue iterating on UE4 so I don’t really see them jumping to a new version.