I’ll just get this clarification out there now. It’ll be outlined clearly in the S18 preview blog that comes before the 2.6.6 launch, but I’d rather everyone be informed in advance.
The Season 18 cosmetic rewards are mirrored to the Season 6 cosmetic rewards; this is similar to how the Season 17 rewards lined up with Season 5. As we stated back then, this is going to be the case moving forward. Season rewards are now on what is approximately a 3-year long rotation. This allows players who never had access to them (such as those on Switch or who are newer players to the game) to be able to acquire them while keeping them relatively limited access overall.
In Season 17, there is an additional reward available in the form of the Galactic Wings. Unfortunately, we were unable to add a similar reward to Season 18.
We may still add similar bonus cosmetics to future Seasons, and really just comes down to where we focus efforts in a given patch. Cosmetics are one of the more difficult things to add to the game, requiring art, modeling, and significant QA testing (especially in the case of wings; we have to thoroughly model and test their effectiveness on 14 different player character models). That wasn’t in the cards for this patch, but it’s not off the table for the future. 