I'm going to make a bold prediction: one of Jessie or James will use Meowth, and Meowth will learn Aerial Ace.
Why is this? It's complicated.
Jessie and James' Japanese names are Musashi and Kojirou. They are named after two legendary swordsmen, Musashi Miyamoto and Kojirou Sasaki. The legend goes that Musashi killed Kojirou on Ganryu Island, a deserted island in the middle of the Kanmon Straits, which a body of water that splits the cities of Shimonoseki and Moji.
Kojirou is famous for a secret sword technique, the "Tsubame Gaeshi", which is the namesake of the Pokemon attack we know as "Aerial Ace". Of the current Team Rocket Pokemon, only Meowth is capable of learning Aerial Ace. There is no better time to milk the first-ever (?) Jessie/James battle without referencing the legendary samurai duel.
James even hinted at this by making puns out of the legend's setting during SM129's PokeProblem (thanks, Lord Starfish):
"Kanmon Kaikyou, Moji Shimonoseki" are also lyrics from "Roketto-dan Danka", the Team Rocket March that seems to have become their main theme song. I'm betting that will play at some point, too!
While I'm all for Meowth finally getting a buff, I get the feeling if he got ANYTHING it would be Dark type move to make use of their Z Crystal.
Also if I remember correctly Jessie and James have battled several times before. Mostly petty unofficial spats in break up episodes but still.