Maybe Team Rocket are departing... we've not even had confirmation thus far of Ash and Pikachu being in the Black and White saga. But if contests are over then it makes sense for Jessie to go where they do take place... surely Meowth won't leave Team Rocket in this episode though- there's still a few months of the saga left.
ChaosMage spoke he truth. There is no real chance of them having Team Rocket depart from the show now (we are not even sure if they will depart altogether). They would never get rid of a main character midway a saga.
More like a Meowth-randomcatpokemonhere love story.