Oh, sure, I just thought it was interesting that it was essentially de-confirmed by the artwork.Iirc Newmoon Island wasn't actually acknowledged on the map until you got the Member Card and went there via the old residence in Canalave.
Though things are actually less straightforward than I thought. It turns out there's two versions of the DP map, one of which has Fullmoon Island and the other of which explicitly doesn't. Fullmoon also doesn't show up in the Platinum map or in what is apparently an anime shot? So the fact that it's in the BDSP pictures is actually somewhat interesting. In some cases, I think it's because they put the logo over that section of the sea, and removed the island(s) to not clutter the area, so I'm curious as to whether its continued absence was intentional or if it was just a case of artists being given the wrong reference documents. I think in the last few generations they've been a little more intentional about hiding or obscuring spoiler areas rather than acting like they don't exist at all, but the status of New- and Fullmoon Island isn't exactly the kind of thing they would probably be holding meetings over. So who knows!
It's presumably possible that Newmoon Island can appear in the game, simply as a nightmare or hallucination leaving no physical traces. The Harbor Inn is still there, after all. It would be nice if they shifted some event-exclusives to be in-game like they did with Deoxys, but that's likely just wishful thinking.
On that topic, though, I wonder how they'll be doing the Regis. It doesn't look like the Regirock cavern is on Route 228, so presumably they're not going the Platinum route, but does that mean you'd have to transfer the trio from Bank to get Gigas? Are Regieleki and Regidrago going to be written into the lore?