I'd still lean towards Ashoka only due to the fact that the voice when processed sounds awfully close to Ashley Eckstein's portrayal of the character. I suppose there's a chance we'll find out given the preview for next week showing a corvette that we know Fulcrum gets around in.
Even if that's her voice, it's entirely possible that they hired Ashley Eckstein to voice a part other than Ahsoka. Either as some intentional misdirection, and/or just because she's a good actress who's right for the role and they want to work with her again.
But yeah, one way or another I don't think this will by a mystery for much longer.
looking back on it, now the mother is the obvious answer. they've been talking up his parents the entire damn season. But I'd be infinitely more excited if it was Ahsoka.
I've no doubt at least one of his parents are bound to crop up, but for me it seems like too much of a co-incidence that Ezra would just so happen to be taken in by one of Fulcrum's operatives. Yeah, yeah I know: "will of the force" and all that. But still....
Unless of course it's not a coincidence and Hera knew who and where he was all along. Hmm.