When I tryed to move my main to another server, using the PCT, I found out something that may interest you guys.
First go to the official wow account-management site (Eu or US), then log in to your account on the site. Click on the Paid Character Transfer and follow the steps.
Choose a character (must be 55+ so you can create a DK) and pick the realm you want to start a Death Knight on, and click the transer button. YOUR CHARACTER WILL NOT BE TRANSFERED AT THIS TIME!
Wait for the approval process, you will get a mail from blizzard when its done.
Now, don't pay anything or move the character. But when it's done log into your account (WoW client), choose the realm you "transfered" the character to and click Create A Character. Make a Death Knight and log in.
Log out and go to the account-management site again and cancel the PCT. You can now play on your Death Knight and on your "transfered" character

I'm from Eu so can't confirm this on the US version.
I didn't know if this were a exploit or guide.. Move it if you need to
