One of the latest Team Fortress 2 updates added promotional items which left people wondering what the items were, well it's been announced on the Team Fortress blog that Saint's Row: The Third will be in Team Fortress 2 via items and hats!
Pre-Ordering Saints Row: The Third on Steam before November 15 will grant you the access to the Cold War Luchador, Mark of the Saint and Apoco--Fists that will be Genuine.
Cold War Luchador
Mark of the Saints
Apoco-Fists
You should also add that people who Pre-order Saints Row the Third will get a TF2 Mask pack that lets you wear a mask of any TF2 class.