I think they're going to add some kind of Nearsight effect to her kit.
This is the reason: Nearsight, i.e. sight reduction, uses the Fog of War to make it look like you're in the dark. Like Nocturne's Paranoia, I think Eve's going to get a new Ulti that Nearsights a single target and makes that target AND herself invisible to every other champion, ally and foe.
The effect being: she's an assassin, but Riot doesn't like 100-0 burst in 1s - they want her victims to have a chance to outplay. With the effect mentioned above, they can lower her overall burst but keep her an assassin - she has do dance with / play with her prey before she kills them. It'd be like the two of them are alone together in the dark.
I don't think it hints toward a Shaco rework, but it implies they will be getting more creative with stealth and invisibility effects - exploring more ways of expressing those effects and their fantasy in-game.