The pair made their announcement via a video posted to Twitter, noting that they are still filming the coming season. Glazer also added that season four will be "coming in hard and raw" in August:
2017's debut is later than in previous years, with last season of the show airing in February this year. Previous seasons made their debuts in January. As Entertainment Weekly points out, that late start date may be due to Jacobson and Glazer's growing careers. For Jacobson, that includes roles in The Lego Ninjago Movie and Netflix's 6 Balloons, and for Glazer roles in EmojiMovie: Express Yourself and Rock That Body for Glazer.
Jacobson is also now an author; she published Carry This Book in October.
How long the show will continue is anybody's guess. In April, Jacobson and Glazer spoke with EW about the future of Broad City, saying that the show "doesn't feel like it should exist forever."
"I would never want it to go on too long where it starts to feel old and generic," Jacobson said.
The show will likely last at least through 2018. Prior to season three's premiere last year, Comedy Central renewed Broad City for seasons four and five. That deal also included the production of Time Traveling Bong, a miniseries starring Glazer and fellow Broad City star Paul W. Downs that debuted in April this year.