STOP thinking about how alliance get high elves. first of all the high elves is part of the alliance but also already part of the horde
http://www.wowwiki.com/High_elf There is no god damn other high elves in wow there is hideing somewhere. PEOPLE need to get this at some point, the high elves was banished from Kalimdor, and created Quel'Thalas, which later got destroyed by the scoughe and then the major part of them became blood elfs. some of them founded Dire Maul( Eldre'Thalas ) This elfes from Eldre'Thalas joined the Alliance in Cata when the night elfes allowed Mages into their ranks. SO GET IT , there is no hidden major race knowen as the high elves, there are the blood elfes, and the high elves there has already joined the night elfes, or is part of dalaran.
and that is not even commenting on how stupid it would be Hordes would get ogres and alliance would get a god damn reskin of the night elfes or just a 100% identic to the blood elfes just with green eyes