User blog comment:G0LD3NF1RE/Skyrim Dawnguard DLC/@comment-86.24.55.168-20120504174809/@comment-4113369-20120504175553

True, but they did say they wanted to give the DLC an "expansion pack feel" (or something along those lines). I think they actually mentioned Shivering Isles as an example of the size they wanted the DLC to have.