Gender locked race?

[Seraphor]

I mean it makes sense. Shadowbringers wants to get hype around it by announcing a new race.
Selling point 1: what is it
selling point 2: What does it look like
Bonus selling point: what do the males of that race look like.
They're just stretching a single feature over multiple sessions to get the most hype they can out of one single announcement.

Then they would have hinted at a reveal in Tokyo fanfest.
Instead they refused to acknowledge it at all, and when asked specifically about male Viera, he didn't say 'wait for more info' he said to 'read the lore in the game', which specifically says male Viera are so rare that no non-viera has ever seen one.

That to me clearly says that the reveal they're putting off to Tokyo, is in fact a separate, male-genderlocked race.

Add to this that Yoshi is clearly very chummy with Matsuno, who created the Viera and has never shown a male. He, like Yoshi, likely thinks that a 'male Viera would be weird' and doesn't want them to be made, so likely has a veto against them.
Further again, they may think that the vast majority would only play as female Viera anyway, so a male Viera would be a bit of a waste of resources, and would instead make a different male race that they might think would get more use and appreciate.