According to Ghostcrawler's Linkedin..
February 2008 – December 2013 (5 years 11 months) Irvine, CA
Led about half of the World of Warcraft design team. Oversaw class, item, profession, combat, PvP, encounter, UI and major feature design. Shipped 3 expansions and contributed to 2 others.
So.. WOTLK,Cata and MOP... Because TBC came out in 2007 (If I'm not Mistaken)
So GC was already "contributing" for the expansion after WoD..?
Maybe WoD is just a filler expansion (Giving that it could last less than 12 months?), and that the next one is the one that "will come out quicker"
What's your thoughts?