The final reveal leading up to the launch of Team Fortress 2's co-op vs homicidal robots mode, Mann vs Machine, gives us a glimpse at a clockwork armful of new achievements, and details how you'll be able to earn some epic, new cosmetic items. For a small fee.
The big reveal here is the new "Mann Up Mode," which will pit you against the mechanical hordes on an "Official Mann Co." server with a chance to earn the new rewards, which largely seem to run along the theme of strapping broken robot parts to yourself and your guns. To be eligible for these (cosmetic only) drops, you'll need to buy Tour of Duty tickets for 99 cents each. Each ticket will allow you to complete a mission toward completing a Tour of Duty badge: a new item that levels up with you and grants you a random rare every time you level it up. Each level of your Tour of Duty badge will require you to complete a set of fixed MvM missions, at the cost of one ticket each. Tickets are only expended on a victory, so succumbing to horrible, metal death won't "eat your quarters" like the arcade games of yore.
Also available for $2 are Squad Surplus Vouchers, expended at the end of any given (successful) mission in MvM that give everyone on your team an item drop. If you're rolling with a full team of six that each bought one, you're all getting six drops if you win.
All of this aside, Mann Up mode can be completely ignored. You can still play MvM on non-Mann Co. servers and earn random drops over time, just like in TF2's competitive modes. All you'll be missing out on are chances at the new cosmetic gear and leveling up your Tour of Duty badge. You can read more in the official FAQ . We're still sorely lacking in an ETA for Mann vs Machine beyond "Today," so keep an eye out. The machines should be marching soon, and we plan to meet them. With bullets.