They did bring Black Sun into cannon in the Clone Wars animated series. Prince Xizor was nowhere to be found but his species (Falleen) were running the organization. With Maul's appearance in Solo, and his arc already involving several of the crime factions (including Black Sun) could open the door to the Dash Rendar character showing up. Heck, they could pull in any number of characters, Kyle Katarn, Jan Ors, Talon Karrde, even Mara Jade along with Dash in the mix in a smuggler/crime underworld series. I doubt we will see Mara, given her story with Luke Skywalker in the old EU, but my hope would be to get her as a top figure in a smuggling crew and leave the "Emperor's hand" force sensitive stuff behind. Probably need to ignore that force sensitive portion of the Katarn character as well.