Hex currently claims that it helps you against abilities but in reality it does literally nothing. As in when you level that ability you are not immune to anything.

It will now work like how it did in the original WCS "Destroy boots of speed and slowdown enemy for 2-6sec by 25-45%, 30% chance"

Put another way Hex is now being fixed to actually be an ability that does something other than just take up 5 upgrade points. I think everyone is going to get the idea that this race is about to become a lot better and more powerful after this next update.