I don't think that's digging far at all. Perhaps it's a coincidence that the fake date of release just happens to be the date of a Smash Direct, but I'm confident there's some connection. It's a fairly shallow dig honestly.
If I do recall, he mentioned that nuetral B while Luma is out summons the Luma back to your side if you are distanced. Side B witht he Luma intentionally puts distance between you to allow separated attacks and her side smash was shown in her character trailer where she bends forward summoning galaxies in her hands that send foes flying. Respectively, Luma punches forward with GREAT POWAH.
Only thing I can't claim to know is how the side B works without Luma out. *shrugs*