Looks as though there is a new faction of pirates being built up, lead by a new(?) Night Elf Pirate called Nightsquall. The book mentioned in this twitter thread explains that he traveled through the "western storms" that are known to be difficult to pass through, which may be related to the other side of Azeroth. He's also collecting members from all the other pirate factions, as well as the Defias.
https://twitter.com/Portergauge/stat...0587663323139?
It was mentioned that Jaina couldn't attend Lor'themar and Thalyssra's wedding due to an issue with pirates. Considering this has been teased twice now, maybe this will be a serious plot for a future expansion?