Ok so on retail TBC+ I was horde and on WoTLK here on warmane I have been Alliance and now I have no idea which path I will take for TBC. My options are..
N Elf - Dudu --- or --- Tauren - Dudu
Human Pala --- or --- B Elf - Pala
Horde racials are far superior to the alliance one in TBC, so Tauren dudu > N ELF (Who can't use their racial in combat...lol), Belf pala > Human pala.
I'm pretty sure the major player base will play horde on outland.