So I had a shower thought today:
I wonder if the long-term plan is to set Reva up to as Ahsoka's shadow-self. Obviously, they haven't said anything about Ingram being in the show, but why would they? Plus, I wouldn't expect something that theme-heavy to appear until a would-be second season.
I know Offee is a more likely candidate for something like that, but they seem to be building Reva up as Vader's apprentice -- Ahsoka's dark counterpart, if you will.
There's a huge time gap between the timelines of those shows. Besides, Filoni would never let someone else's character appear in one of his shows (aside from Lucas, of course.)