Ding ding ding, we have a winner!
D23 has never ever been a convention where trailer after trailer drops. At least in terms of theatrically released movies. Disney+ is more liberal with trailer launches, but streaming services are a whole different ballgame when it comes to ad campaigns.
Anyways, it's always been one big trailer that gets released to the public (Little Mermaid, Rise of Skywalker, A Wrinkle in Time), then everything else is con-only, with only journalism tweets and the occasional still image or poster thrown in if Disney wants to give a little extra. And it makes perfect sense. Disney and their numerous projects are still getting talked about and trend on social media, so the normies can still pick up a few tidbits, Disney fans are still being shown hype stuff that gets that fandom excited, and it makes it easier to juggle every project, especially ones that are bigger priority at that point in time. Little Mermaid hasn't started its marketing campaign and Avatar already has. Avatar made a humongous splash in fact that got people excited and converted a few skeptics. A trailer specifically dropping on this specific weekend was not needed. And it's not even a Comic-Con thing where Avatar is nonexistent. It got its time.
And I know for some it stings that you aren't getting a trailer sooner or you think that this means Disney doesn't care about Avatar (which can we stop with this crap? You know damn well that's not the case), but The Quorum already shows there's a lot of hype with Avatar, amongst film nerds and the GA. It already has the highest Awareness, 65%, of any movie charted. In terms of Interest, it's third, still way ahead of almost every movie out there. People know it's coming out and people are excited. It'll make a ton of money, you're getting more sequels, Cameron's still gonna be rich. Chill.