Pokémon BW: Rival Destinies, the 15th season of the English dub started on Saturday, February 18th, on Cartoon Network in the United States. The first episode of the season, Enter Elesa, Electrifying Gym Leader! features the anime debut of the Nimbasa Gym Leader Elesa. A new opening song called Rival Destinies debuted in the episode and it has been added to our OP/ED Database. Also the lyrics for the song have been added to our Song Database. Dub edits from this episode have also now been added to the episode guide.

Press Release

Don’t miss the first episode of the Pokémon: BW Rival Destinies season this Saturday at 8:30 A.M. The action picks up where the Pokémon: Black & White season ended, with Ash preparing to battle Elesa at the Nimbasa City Gym. Every Saturday, another new episode will air—be sure to tune in each week to discover where Ash and his friends will go, and what amazing Pokémon they’ll meet!

Source: http://www.pokemon.com/us/pokemon-news/anim_season15_announce-2012-02-13/

Wow I didn't even know we had an OP/ED database with screenshots. Thanks for the information!