A new "challenge pack" has been release for Lara Croft and the Guardian of Light called "A Hazardous Reunion Challenge Pack 3 ".There has not been any real information released on the map pack apart from:

"Four new challenge maps featuring mind-boggling puzzles, waves of intense combat action, and a fiery reunion with an old friend. "

Download it here (400 MSP): A Hazardous Reunion Challenge Pack 3 - Xbox.com

Personally I won't be buying it as I thought the initial game was awful.