I remember quite a few instances leading up to ARR where Yoshida name dropped WoW as a main point of reference, but I don't have specifics quotes offhand either. He still brings up WoW a lot in interviews to this day. He's a big fan of Blizzard in general though and mentioned in a pre-ARR Letter from the Producer that he actually visited Blizzard's campus at one point to talk to the WoW and D3 teams about game development, operations, etc.
