For Season 3, Riot is fiddling with the structure to make a new league ranking system that should offer a "greater sense of progression." Players will battle it out in six tiers of similarly matched teams until the cream rises to the top. To help all players understand the changes, Riot's provided a handy infographic and FAQ covering the pertinent points.
There's also a goofy promo video of players running around an empty stadium in slow-motion, and you know you want to see that. It's after the jump. Thank us later.