Updates to Left 4 Dead 2 have been released on PC, and they could very well be on their way to Xbox 360 soon. Below is a list of the updates provided to Steam players. It hasn’t been confirmed yet if Xbox 360 is getting all of these or some of them.

A new Left 4 Dead 2 patch for the Xbox 360 has been released in the early morning of December 22, 2009. It has not yet been confirmed on everything that it has changed, but the most notable of changes is to the scoring system.
Incapacitation bonuses have been removed from Versus scoring completely. Now there [...]

UPDATE!
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This story was found via Kotaku regarding the new DLC for Left 4 Dead 2. This is extremely exciting news to die hard fans of the Left 4 Dead series as this DLC promises to bring Bill, Francis, Zoey and Louis into the world of Left 4 Dead 2.
“The Passing” offers more than just a [...]

In Steam News there was an announcement for a new patch for Left 4 Dead 2 with a list of many different updates. I have provided a link for you here as well as listed some key points made.
Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your [...]