@Riot Could we get some info on what changes to Stealth are coming in the Assassin update?

I'm a big player and by big I mean he's practically all I play theses days; so when I heard about some changes coming to Stealth mechanics, it got me a bit worried. While Twitch isn't directly being changed for this update, the stealth changes will still apply to him if I'm correct. I can't be the only one worried about this and I'm sure there are many and even mains out there thinking the same thing.

So my question is: what sort of changes are we looking at? Are there any hints/ assurances you can give to let me know my only form of escape and large part of my engage will remain intact? Anything would help ease my worries :)