If I get invited and can't play a dwarf or elf I might as well. Humans are boring, the only time I every tried a 'beast' race was worgen just cause they were added and didn't care for them.
But if I can get something similar I might look at the character creation screen and try to make a character I like, cause if I play a game I better like the look of the character im playing the entire game, otherwise I won't enjoy it.
But if I get a beta invite I will try and see if I can make a race workable to my liking, if not then its a waste of a beta key cause its hard to play a game looking at a race I don't enjoy looking at.
This is why I browse forums on my iphone and second monitor.