So, didn't like everyone think Lucario was a legendary? And then didn't it turn out he had a prevo and wasn't? Didn't even have a role in D/P?
And doesn't Zoroark have a lot with Lucario in common? Prevo, star in a movie? Then wouldn't it be logical to assume that the same will happen to Zoroark? Just being an average pokémon like Lucario?
The answer is yes.