Mann VS. Machine Mode for Team Fortress 2 is set to get a big update, with Valve preparing a patch designed to bring more tours, loot, and improved matchmaking.
Responding to player complaints that the original Tour of Duty (Operation Steel Trap) was too hard, Valve will be deploying two more: Operation Oil Spill (“less hard”) and Operation Gear Grinder (“very hard”).
The new operations will also include their own loot, such as “rusty, blood-covered ‘bot heads” for Operation Oil Spill, and “24-carat diamond ‘bot heads” for Operation Gear Grinder, presumably to enable more effective boasting.
Finally, the matchmaking system — one of the biggest gripes we had with the original — has been updated to allow you to select multiple missions you’d like to play, to increase your chance of, you know, actually playing. Additionally, your group is no longer automatically disbanded once you’ve beaten a mission. Which is nice.
Source: TF2 Blog