I "want" them to be added as new faction on both sides (just like scoundrels right now) having Pre Vizsla, Bo-Katan and some "generic Mandalorian Warriors" (you could also call it Death Watch) on the dark side and Satine + some "generic Mandalorian Guards" on the light side.
Not sure about Sabine Wren, if she should be added as Mandalorian or as Rebell ... maybe both, just like Vader is Sith and Imperial ... however, i think, she will most likely more seen as a rebell, like Jango/Boba Fett are more like scoundrels ...
However, the dark side mandalorian should be real warriors... to me, the Mandalorian are the Spartans of Star Wars! ;)
