A non-numbers nerf to Zed, aimed particularly at helping newer players.
It's a simple one really, adds clarity for the poor squishy about to be assassinated so that they know which direction their death is coming from.
Add a shadow poof visual effect to indicate where the untargetable Zed is about to reappear. It would give players (particularly newer ones) quick visual feedback that can help them plot their next move (such as Lux binding you under the turret that you shouldn't have dove at &<10% health).
If it's impactful enough, they may even be able to revert some of the timing nerfs on Zed jumping back to his ultimate shadow.
I threw together a qucik Gif demonstrating the concept with my amazing flash skills: http://i.imgur.com/AwKYGLr.gifv
For the record: That Lux was a beginner bot.