Valve is making good on their promise to release additional content for Left 4 Dead. According to what our sources are telling us we can expect additional downloadable content to arrive for the Xbox 360 and the PC at some point this summer.

What will the new downloadable content contain? Well, we have no real idea, but we expect it to contain additional maps and maybe some new infection types or perhaps a new character. We also have no clue yet on how much it will cost.

Valve seems to be very sensitive at this point about the negative press it has received in the user community about the announcement of Left 4 Dead 2, as well as the community accusing Valve of abandoning the first Left 4 Dead title too quickly. It seems important now that they make sure that those who purchased the first game know that they will get the additional DLC that they were promised at the initial release.