Some bigger than normal preorder and DLC news abounds from Gamestop and the X10 event.

First, the DLC:
Left 4 Dead 2's "The Passing" DLC is dated and plans made for subsequent release of the original survivors POV in the event via L4D1.

Dead Rising 2 may be multiplatform, but the prologue will be released only via Xbox Live on Aug 31st.

And now the preorder stuff:
Crackdown 2 preorder announced - Special Agent Armors

Transformers: War for Cybertron preorder announced - Shockwave Multiplayer Character

Enjoy!