That Guardians Of The Galaxy: Vol. 3 Comic Con trailer isn't coming anytime soon, says James Gunn
The director claims that "some VFX aren't where [he'd] want them" for the teaser at this time

It wouldn’t be San Diego Comic-Con if Marvel didn’t drop a trailer or two in Hall H, and that’s what the nerd masses got during the explosive panel this last Saturday. While the MCU’s next superhero blockbuster, Black Panther: Wakanda Forever, released its emotionally charged trailer to the world, the footage shown of Guardians Of The Galaxy Vol. 3 will remain confined to those few lucky fans in Hall H for the time being, according to director James Gunn.
In response to a fan voicing disappointment over the non-release of the Guardians Of The Galaxy Vol. 3 trailer, Gunn replied on Twitter that the VFX weren’t “where [he’d] want them to be” for the deep-dissection and multiple viewings the trailer would receive.
“I wish you could have too,” tweeted out Gunn. “But it’s not just Marvel, it’s also me. Although I love the teaser some VFX aren’t where I’d want them to be for repeated views & close inspection—remember we didn’t wrap long ago—so you’ll have to wait just a beat! Sorry!”