An upcoming issue of the Japanese magazine CoroCoro is set to reveal
Pokemon #647, Keldeo. Although Keldeo along with Meloetta and Genesect are already known by fans, none have been officially revealed by Nintendo.
Keldeo will be the star of the next Pokemon move, titled Kyurem Vs. The Sacred Swordsman - Keldeo
. Meloetta appears to have a role in a short film, Meloetta's Sparkling Recital
.
There is no word yet on when Keldeo will be available in the Pokemon games, nor whether it will be in Black & White or an upcoming game.
Keldeo's official artwork
As I write, Pokemon Smash is airing in Japan so we may have some new game news very soon!