We're not exactly used to finding out hot scoops on Valve's game projects from Xbox Live's "Inside Xbox" feature "SENTUAMESSAGE," so it was especially odd to us when we heard that Left 4 Dead 2's upcoming Left 4 Dead 1 crossover DLC "The Passing" got an official price (560/$7) -- and an ambiguous new release date of "Spring" -- from the feature. But that's just what the latest episode told us, not to mention a handful of new deets on the DLC, including info on new variations of enemies and a few new weapons.

Back at X10 in February, Valve told us that the content was set to arrive on Xbox Live/Steam by "late March," though it seems that the window has been extended a few more months. We've fired off an email to Valve to see if a more solid release date exists, and we'll keep you updated if we hear anything back. In the meantime, we've embedded the Inside Xbox clip after the break.

[Via Kotaku]