L4D did well so they scrapped the DLC plans (finishing the game by adding versus to DA/DT does not count, no) and went for a faster moneygrab worthy of EA. The mentioned improvements from this L4D: San Andreas expansion would have made for some very reasonable DLC, like a lot of people who bought the game at full price were kind of expecting. I like L4D a lot and have gotten good entertainment out of it but a one-year sequel is not enticing.