Not usually one to jump the gun on this sort of thing, but I thought it was easy to connect the dots on this occassion.
Found this calendar image floating around, and noticed that it features some interesting character selctions.
Some of these have already appeared during the first 6/7 episodes of season 2 (Reuniclus, Ferrothorn, Cinccino, Hydreigon), while others (Krookodile, Riolu, Vullaby, Samurott) we know are going to turn up in future episodes thanks to titles and summaries. Some like Corphish and Eevee were also shown on the first promotional poster we saw for the season.
There's also a set of pokemon kid's figures coming out that features a number of the pokemon that also appear on the calendar. It's worth noting that these particular sets have correlated to upcoming pokemon appearences in the show often in the past.
So if these are indeed going by the appearances of pokemon in the show, the remaining characters include these dudes