Probably too early for this kind of question, but still...
Do you people (at Obsidian) have expansion(s) in plan for Deadfire?
If yes, will it probably be an integrated parallel story (as White March), or a smaller separate campaign, or additional endgame "act" (somewhat as Throne of Bhaal)?
I personally vouch AGAINST expansions and story DLCs, because today it's mostly either stuff cut from the original game, or something made "artificially" to waste time and water down the original experience. But from a financial point of view, it's probably better (for the company) to have additional paid content in offer.