A Sneak Peek of Cassiopeia's upcoming MYMU. Numbers haven't been confirmed by Riot yet.
Aspect of the Serpent (Passive) NEW INNATE: Cassiopeia cannot purchase Boots and instead gains movement speed per level.
Miasma (W) REMOVED: Miasma's Poison no longer deals damage. NEW EFFECT: Miasma's Poison now Grounds enemies, preventing them from casting Movement abilities. NEW EFFECT: Now deals damage as a persistent area of effect. Damage reduced. Slow reduced.
Twin Fang (E) REMOVED: Cooldown reset versus poison. NEW EFFECT: Now deals bonus damage versus poison. NEW EFFECT: Heals for a percentage of the damage dealt. Cooldown reduced to 1 second from 5.
The only good things is her E and the 'Ground' effect her W will give if it comes live. Everything else is just Riot's balancing in the nutshell. I'm hoping that the change to her passive doesn't come to live servers, because that would suck.