The announcement took place at the Final Fantasy XIV 2016 Fan Festival held in Las Vegas. Stormblood will roll out "a full game's worth of content," according to Yoshida. Besides more dungeons, raiding zones, and Primals, you'll gain access to a fourth residential area linked to the story.
Given the town area's ties to Final Fantasy 14's narrative, Yoshida stayed mum on specifics, including its name.
Besides an expansion, Yoshida shared an overview on changes coming to Final Fantasy 14's 4.0 patch that will drop alongside Stormblood. The level cap will be raised from 60 to 70, new jobs will be added, you'll be able to get new equipment for certain jobs, and the battle system will receive a makeover.
One of the larger revamps involves FF14's skill tree. According to Yoshida, little-used skills as well as those that don't serve much of a purpose will be "reassessed," meaning tweaked or possibly phased out.
Square aims to release Stormblood and the accompanying 4.0 update for the base game in early summer of 2017.