I seriously doubt we will get anything like what WoW offers. Remember, this is Cryptic and until STO they've never done any serious end game content. Even Dan Stahl has said Season 7 is the last of the end game content for the short term and Season 8 will seek to bring in new gamers.
Still, it is getting clear that S7 will see the introduction of "weapon sets" for the general population, kind of like the Ferengi and Temporal sets found in the lobi store.