Just saw this over at drhorrible.net....
We’re already working on some of the DVD extras, which are going to be the finest in all the land. We’re actually going to do, in addition to the commentary, what we refer to as ‘commentary with an exclamation point’! A musical commentary that is a completely original musical, that is all commentary songs, and we’re writing that now… We’re just piling it on. We’re like, we’re going to make more fun of the idea of extras than anything else.