I would attribute the forgetting as well as lack of discussion to the fact that most of the new stuff in Royal has been discovered because of the Japanese release being earlier than its international release and Scramble taking some of the hype from the international release for those who were impatient (like me) and followed the Persona fans who were translating/relaying the Japanese stuff. So at this point it's a bit meh. It doesn't help that the English advertising isn't quite as hype as its Japanese one or, heck, even Persona 5's original release.
For the Japanese advertising of Royal, there were two teasers, three proper trailers, and character trailers for all the Phantom Thieves and the two new characters, Kasumi and Takuto. Not to mention all the Morgana Reports talking about the game. For vanilla P5, all the Phantom Thieves get their own trailers (though shorter than Royal's) in both English and Japanese. But what does Royal get in English? Just five trailers. One of which is all the Thieves are in one trailer. Not exactly the most hype advertising.
It's almost like Atlus knew their English audience would be watching the Japanese release and so lessened the trailers for English. But that's probably just me and my analytical mind.
So while I'm looking forward to it, I'm not hyped like I was when it was still about to come out in Japan.