Riot just keeps making my year better and better.
Alistar's new bio is basically the same as his old one, but with far more content and details. It goes into how the Minotaurs sided with Noxus, how Alistar was captured, and how it affected him. More importantly though, it gives more insight into his friendship with Ayelia and their escape.
Hopefully he'll receive a color story, and maybe even a VO update, sometime in the future.