Back at the Blizzcon prior to Legion's release, a Summer (NA) 2016 release season was announced:
https://www.youtube.com/watch?v=eYNC...youtu.be&t=226
We are now 2 months past the Blizzcon prior to BfA's release and we still do not have a release season for the expansion. In fact we don't really have much info about this expansion at all. This is a little disconcerting as it suggests that a lot is still up in the air about this expansion. I am concerned that if something as simple as a release season isn't announced very soon, that there is a possibility of this expansion being released as late as Winter (NA) 2018 which could make Legion's final patch the longest in the history of WoW.