okay first of all let me clear this up that this isn't KH3. Nomura's not even working on it he says (and this is from IGN for those who wanna say PROVE IT) the secret ending is showing events from a new series related to kingdom hearts but in announcing this nomura emphasized that it's not KH3. It's a new series focusing on Xehanort and the Knights, and as it's a series there will be more than one game. He didn't tell if Sora and the others were in it (but he did laugh at the question).
Anyways, I'm not about to make pointless theories, but you can tell the bald guy's a lot like Xehanort's heartless in appearance, but older. The thing that comes out of him with the power ranger helmet, I'd definitely say he's related somehow to Riku's Dark Mode, seeing the similarities in the costumes. they're not EXACTLY alike but anyone who's not blind can see the resemblance. I have no idea who the night with the black/yellow eyes is or the blue one either, but the one who was turned to stone looked exactly like Roxas. That doesn't mean he IS Roxas, just noting the resemblance. But what seemed weird was when the bald guy killed "Roxas". It looked like black/white fire, which looks a lot like nobody thorns. This is most likely the past seeing how it's focusing on Xehanort and Xehanort's already gone, but why did Mickey have Starseeker?
