I think its a clue that in the epilogue they are talking about an engine fix and Withers tells us that this isn't over.
Maybe a descent into Avernus is on the horizon, depending on your choices you are either avenging what happened to Karlach or saving her. Along with that update they will polish the last act further and breath more life into it.
In the last game they made a funny new character companion, I see no reason for them to flesh out Minthara and maybe Halsin into having some more content that brings them to the same level as the others. Honestly this last bit is more wishful thinking on my part than anything else.
