What's wrong with Twisted Fate?

Does anyone know what specifically happened to Twisted Fate to get him temporarily disabled? I've been playing a lot of JG Twisted Fate lately because he's the only jungler besides Eve who I not only enjoy playing, but actually get their kit, and I already miss him... If any Rioteer/Player knows what's going on with my best friend TF, please comment or leave a link to the info. Thanks