It has been hinted that Irelia's brother Zelos is possibly being made into a champion and is currently in development.
Irelia, together with Trundle, has the highest potential tenacity stat in the game, capped at 64.9% (40% from her passivepassive, granted at least 3 enemy champions are within her sights, 10% from the Juggernaut mastery and 35% from any tenacity item in the game, i.e. Mercury's Treads after being calculated with diminishing returns). Thus, the duration of almost all crowd control effects in the game can be cut by more than half against Irelia.
Irelia is the focus of a LoL meme "better nerf Irelia", in which Morello determines that a certain champion is currently overpowered, but chooses instead to nerf Irelia, due to his numerous alterations to her skillset.
Irelia received nerfs one day before her release because Morello said she was too "annoying to play against."