Ok, so I was walking around Thunder Bluff minding my business and all of a sudden I saw a Tauren riding a white cat. At first I thought it was one of those mounts that you get from cards (like the Spectral Tiger) but I moved the cursor over his icon buff and it said Swift Moonsaber, after a quick wowhead search I found out this mount is available through the argent crusade quartermasters in icecrown and only alliance could get it.
So I had a talk with the guy that was riding it and after a lot of persuasion he told me that he was alliance and he transferred his character to horde but when he logged out on his alliance char he was mounted on the Swift Moonsaber and when he logged his tauren the mount was there.
I'm looking for some one willing to test this cause I only have 1 char and I can't afford to transfer it due to guild issues...
I only hope the guy didn't lie to me...