Yesterday we reported that the Left 4 Dead 2 demo included references to unannounced DLC, two of them, to be precise, but Valve’s Chet Faliszek has stated that those names are placeholders only, in case they decide to release DLC. Faliszek said,
If you’re reading in the forums and you’re reading about the “Miracle” DLC or whatever, that’s test code. To get tested through Microsoft certification we had to do test scenarios with DLC. We haven’t actually come out internally with what we’re going to do yet.
Seeing that Left 4 Dead has received DLC packs, there’s no indication that the sequel won’t. After all, DLCs are big business, just look at Bethesda and Fallout 3.