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Any bets who the rest of the other trainers might be? I think the guy all the way at the back is Bruno. He's E4, so no doubt that he'll be the final opponent before Ash gets to challenge Raihan. It also makes sense since he's the most distant one.
The girl with the long hair is probably Leaf from LGPE/FRLG. Her hairstyle matches up with Leaf's. My guess is that her team will be similar to Gen 1 Ash's team, and her character is meant to be a female counterpart to Ash. For one, she's standing next to a Clefairy who was supposed to be Ash's mascot pokemon before they decided to go with Pikachu instead. Secondly, they'll probably make her a Venusaur main which would be fitting since Ash was also supposed to have a Venusaur based on early promotional material. There's plenty of PM2019 promo material that features Charizard, Blastoise, and Venusaur. Ash and Gary are known for using Charizard and Blastoise, so Leaf will probably used Venusaur.
Dunno who the guy with the slick back hair is supposed to be.