Some of these are pretty wild ngl (phoenix/iso/reyna), but there's also some good stuff here. I could see some of the others happening although probably not all at the same time, considering rito would want to see how certain changes impact other duelist pickrates.
As a neon one-trick, I do want to talk about the neon changes. I'm really skeptical of changing the slide cooldown to 1 kill. I think it would be completely broken. Being able to slide peek an angle you know someone is holding, get a free kill, and then proceed to do it again and again sounds insane to me. I think giving high her gear a faster recharge rate would be a better way of buffing her signature. I also don't think changing the stun activation time is necessary. I actually really like the way her stun functions with how you have to think on the fly and throw the stun accordingly depending on how you want to take the fight. Its a pretty satisfying gameplay component imo. The stun getting an extra half second is really good, would definitely allow for more space to be taken, especially when you're stunning for your team who can't scale up as fast as you can. I have seen a lot of discussion about giving it 20 damage to break senti utility, but that also might be way too good, being able to break 2 locations (and twice!) without exposing yourself is too powerful.
I like the wall damage coming back and the slide being longer. I actually think giving her slide the 20 damage in an aura around her would be interesting so she could hard entry through util, particularly cypher trips, as shes the is basically the only duelist that can't do anything about them.