Call me crazy but
I've been thinking. What if we get Homs Fiora as playable DLC and she transforms into Mecha-Fiora for her Final Smash?? Since the Homs Fiora trophy we saw had a unique model as well, not based on her official artwork.
It's a possibility. A disappointing one, but still possible. That way only her Final Smash would be a spoiler. Wouldn't make much sense from a series representation viewpoint but in the end it would be Sakurai's decision.
I would still of course prefer her Mechon form to be playable off the bat because of more moveset practicality. But really as long as she does become DLC I'd be happy either way.