As mentioned in the Test Realm patch notes we posted on last month, a blue Blizzard post confirms that they are indeed removing restrictions to allow players to create Death Knights on any server.
https://lastchance.cc/death-knight-changes-in-the-works-5108442%3C/a%3E%3C/p%3E
With the next minor content update for World of Warcraft, we will be opening up death knight character creation so that if the account you play already has a level 55 or higher character in World of Warcraft, you will be able to create a new death knight on any realm within your region. Please keep in mind that restrictions still apply to new, non-transfer realms such that death knights cannot be created on those realms until you level a character to level 55 on that realm or until transfer restrictions are removed.
Those of you who paid $25 to transfer a 55+ character to a friendās server in order to play Death Knights with them before this announcement remain completely screwed.
Account-Wide Death Knight Creation [World of Warcraft Forums via WorldofWar.net]
