It is apparently responsible for the recent 40% developer team increase which was already increased by 40% for MoP. There has been talks to use that increase of development resources for quicker mini content patches so things like raids might still be on the slow side. The end of the expansion lull is the worst IMO and leads to problems going from one expansion to the other like one year of overgeared and nerfed content in WotLK and going into Cata was such a huge shock that I think even if Blizzard reskinned WotLK for Cata that players would have QQed about lack of content and difficulty of content.