Pretty small changes overall. So, you know, we're just going to turn her into a melee range, male tank that hits people with clubs made of ashen wood he holds in each hand. And he'll be from Shurima of course.
Bad jokes aside we're not looking to change the core of Ashe. Same slow on auto attacks, same global stun ult, same long attack range etc. Changes are focused primarily on making her passive and Q a bit more engaging, consistently relevant. In terms of scale think roughly along the lines of the recent Zilean changes or the Viktor changes from a few months back.