Updated: The content has been restored!
It appears that last month, Activision closed down Luxoflux Studios. Luxoflux were the developers of the Transformers: Revenge of the Fallen Game. As of the writing of this article, it appears that the downloadable content has been removed from the XBox Live Marketplace without notice and can no longer be purchased. I cannot verify if this is also the case on the Playstation Network.

The DLC was first made available August 27, 2009. That means it was available for less than 8 months before being pulled. The content featured 11 new playable characters, 3 new maps, a new expert difficulty level and all new achievements. We posted a trailer of the DLC here.

As a fan who only recently got an XBox 360 with this as his first game, you can imagine my disappointment that I now cannot have the chance to play this new content that I am more than willing to spend money on. Hopefully Activision can find a way to put the pack back up for a limited time for those who had not gotten it yet.