What I got if I am donation until revered?

I just wanna to know what I will got If I am donation some accounts until revered? Just get 10% extra coin? Or something else?

No queue for realm joining and some additional coin based player to player market places open up. Also your characters dont get deleted when you are inactive for some time (wow blues) and last not least you may ask service if needed.

Also read:
http://forum.warmane.com/showthread.php?307442

Is that true if I am donation until exalted, I can get buy legendary mount? Like an Qiraj or chicken rooster.

Black Qiraji Battle Tank is available on Icecrown at Exalted donation rank. I don't know about other realms and I haven't heard about any other mounts that are available at Exalted donation rank. As far as I know, Magic Rooster is not available, at least on Icecrown.