This new Pokemon Black 2 and White 2 promotional movie seems to be more based on the current Pokemon Manga of Gen 5. Of course the Anime Adaptation hasn't followed the Manga Storyline since the end of the Indigo League back at the end of Gen 1 with Kanto which was meant to complete the storyline of Ash Ketchum/Satoshi Tajiri as the Main Protagonist of the franchise. But like how Akira Toriyama was forced to milk Dragonball for what it was worth, Pokemon fans wanted the same with Ash Ketchum and Pikachu cause they are the posterchild of the franchise.
I like the Mature feel of this new Promotional Movie which is amazingly better than the Anime Series itself. Makes me wonder why they didn't let Ash win the Sinnoh League just so we could of started with a new Main Protagonist to keep the Anime fresh and new but it just wouldn't be Pokemon without Ash and Pikachu right? Pokemon is one of those franchise's that is eternaly bound by nostalgia which has been Nintendo's schtick for a long time now. You see it in Mario, Zelda, Kid Icarus, Donkey Kong, and other franchises by Nintendo as well.