Southsun Survival/Aspect Arena back items
It would be a good idea, but ArenaNet has a thing about temporary content and rewards. One of the devs said the two returning dungeons in the form of fractals will likely never have the rare loot drop items (jetpack and monocle). They also said the achievements are specific to the events, so any mini-game achievements need to be obtained during the month the mini-game is introduced.