WotLK Fraction Change Draenei Shaman

[idomo]

Hello, i just wanted to ask what this sentence means:

▪ Character's race changed to the chosen opposing faction race

Does that mean i cant choose my race if i change ot the horde?
And if i can choose the race, which will i get as a Draenie Shaman?

[Strandell]

You get to choose which of the possible horde races you want to become.