The theme for the 2010-2011 Pokemon League will be Johto-related, but won't feature the Gym Leaders. Instead, each League season will be based around a Pokeathlon event. The League promos will follow the same pattern as last year - one nice-to-have promo featuring a Pokemon who does well at the Pokeathlon event in question, and one gotta-have promo featuring a card that's in high demand by beginners and Pokemon TCG masters alike. Each League promo will have the same funky foil treatment as last year's promos, with the new Play! Pokemon logo watermarked in the text box.
The first League season will feature the "Ring Drop" (a sumo wrestling-like event) and the promos will be the non-Prime Donphan from HGSS and Spiritomb from Arceus (oh yeah!).
More info on the rest of next year's League promos as it comes out.