Has Johnny Depp provided a voice over for some of the chars in World Of Warcraft?

Im playing the cataclysm updated version of WoW :) (may i say its pure awesomeness! :D :D ) Just started a Worgie ^^ and im running some quests thru in Gilneas ... when i come across a char called "Marcus" hand in a Quest n ofc uses the popular phrase "any friend of Greymane .... is a friend of mine!" .. BUT IT SOUNDED JUST LIKE JOHNNY DEPP (like in 'The Headless Horseman') so just wanna know if anyone know if he actually did? and if any any other celebs have provided voice overs??