
Originally Posted by
paul (dragon master)
According to the summary on Famitsu, the gang along with the Shin'ō League Champion Shirona will head to eastern part of the Isshu region, which has many non-Isshu Pokémon populating it. They also encounter Hikari, one of Satoshi's previous traveling companion. Meloetta will later become Satoshi's friend and journey with them.
this information comes from Bulbapedia (have no idea how accurate they are) going by other wiki's this shouldn't be all that reliable. so according to this little passage and not trying to get any hopes up, it seems like Ash, Iris, Cilan, Cynthia, Dawn and Meleotta are going to travel for a little while. but I won't get my hopes up knowing how reliable wiki sites are (not very). So all we can do is wait and see.
followed by that is Ash getting a new rival and Team Rocket causing a huge amount of havoc (finally a decent plot!). Pokemon hasn't had a decent plot since ever, it's more like collect eight badges and get eliminated in the regional league
remember I don't know how reliable Bulbapedia is, so please don't hold it against me for trying to shed some light onto the topic. i agree with Truest_friend it will most likely be a mini arc, but knowing the writers they could surprise us as well