It's really hard to make a build to start off the game with when we don't even know all the subclasses, races, subraces, deities, and Warlock Patrons, ect... in the game.
I will likely go with Race: Aasimar Subrace: Scourge Class: Sorcerer, Subclass: Divine Soul, Background Acolyte or Noble, maybe with a dip in Warlock and/cleric.
If that is not an option, Race: Tiefling Subrace: Fiernan, Class: Bard, Subclass: College of Lore, multiclass Paladin Oath of Ancients.
Oh and the one origin character I will try during EA is the Githyanki, make her a Battlemaster Fighter.
The only thing in the build that is not sure to be in the game is the Elven Acc feat, that is why I called it premise. All the other stuff is in the PHB.