Trust me when I say there’s a 99% chance the guy who cough “confirmed” that was just making it up. Let’s face facts here people, the dev team simply doesn’t care about Luna half as much as certain members of the community, the only episode she appeared in she literally had one line and less then a minute of screen time.
Plus, Equestria managed to thrive for a thousand years without her and the first thing she did when she came back was try to take over the world, I very much doubt the characters should even trust her let alone throw her a party.
As it stands Luna has as much canon in the series as Derpy, and every other aspect of her personality was made up by the community. The only reason I’d want to see her again is so we can get some real official characterization… done by professionals who are GOOD at balancing a character.