When is the last time you saw a Sivir in game? Other than the close knit clique of dedicated split pushers, I rarely see a Sivir hit the loading screen. Phreak has made mention in the past of a Sivir rework but we haven't heard much news about it. Below is a small tease of new information relating to the neglected Battle Mistress.
the official forums.Current iteration of Sivir remake has a new passive.
Let the speculation commence!
Just for reference, Sivir's current passive reads " Sivir has an increased dodge chance by 10 / 15 / 20 / 25% while moving." Remember that this information is tentative and may change.