Jest Chillin
Member
Technically speaking, several WoW expansions did the same thing.
WoW has slowly improved their graphics over time but I think they've only done one major graphical overhaul. Similarly they've only gone scorched Earth on content once, and that was Cataclysm. Which was 9 years after the vanilla release.
Really the only reason Cata was called an expansion is because there's no way the WoW playerbase would have bought a sequel at $50 and up after having 9 years of $40 and up "expansions."
Really though, the only difference between a Sequel and an Expansion is that a Sequel requires a new disc/client while Expansions are major updates to the current disc/client. But this stuff all gets muddied in the Console sphere due to disc/carts vs. digital and what the console audience is used to.