1 - No class butchering (like nwn2 did to warlocks, they transformed the one of the strongest class into one of the weakest)
2 - cool necromancy
3 - Lurker of the deep warlock
4 - Any rule alteration optional
They said they pretty much sticking to the rules, where possible. So I'm trusting that they won't butcher the classes. That said, it's not looking good for the Variant Human. A real shame, it's not really overpowered, when you add in all the extras demi-humans get.
I wouldn't count on Larian using anything from Unearthed Arcana. From everything I've heard, WotC has abandoned that in it's current form. If the game becomes moddable, somebody will put it in. What with Xanathar's Guide to Everything, and Wayfarer's Guide to Eberron replacing it.
