Syfy officially renewed Haven for a 13-episode third season last October and production started last month. While the previous seasons had a summer release, Syfy has pushed back the season 3 premiere to September.
According to Haven co-star Eric Balfour, the third season will premiere in the US on September 21st at 9pm. While we don't have specific details on upcoming storylines, it was previously revealed that the new season will pick up right where season 2 left off:
"Season three of Haven picks up immediately following the events of the gripping season two finale where Nathan (Lucas Bryant) was warned against pursuing a romantic relationship with Audrey (Audrey Rose); Duke (Eric Balfour) learned his family legacy was to kill Haven citizens with troubles; Audrey went missing, and Nathan and Duke engaged in a seemingly deadly argument.
Haven, based on the novella The Colorado Kid from renowned author Stephen King, follows former FBI agent Audrey Parker, who becomes a cop in the small town of Haven, Maine, and soon discovers the town’s many secrets, which also holds the key to unlocking the mysteries of her lost past."