Left 4 Dead DLC Coming Soon

Valve announced that there will be new DLC coming to Left 4 Dead.  However, they said nothing about what it is or when it releases.  I was a little shocked when I saw this, because it doesn’t really make sense to release DLC for a game that is getting a sequel in a few months.  We also don’t know what the price will be.  Because of Valve’s history of free DLC, I would assume that it will be free-of-charge on the PC.  However as for the Xbox version, assholes Microsoft might force Valve to charge for the add-on.