The patch notes say it's automatic, that we don't choose our race. Which race becomes what?
Update: looks like races default to another one, with exceptions based on class
human > undead
Dwarf > orc
Night elf > troll
Gnome > goblin
Draenei > Tauren
Worgen > troll
Goblin > gnome
Pandas to pandas
Blood elves > human
Orc > dwarf
Undead > human
Tauren > night elf
Troll > night elf
Goblin > gnome
Confirmed exceptions
Dwarf paladin > Tauren
goblin shaman/Hunter > dwarf
Gnome monk > blood elf
I'll keep this updated