The upcoming DLC pack for Left 4 Dead 2 will not be released in March.
According to Inside Xbox’s SentUAMessage program on Xbox LIVE (via VG247), The Passing DLC will miss its unofficial March deadline. The show also confirmed it will set you back 560 MS Points upon release.
The Passing sees the characters from L4D2 joining forces with the group of survivors from the first game, although Valve has confirmed one character will not make it. Valve also announced last week that as well as new ranged and melee weapons The Passing will also addto the online shooter.