As the Steam store page details, all TF2 classes get to slip on a Monday Night Combat cap while the TF2 Scout receives the stylish accessories of MNC mascot Bullseye. Each MNC Pro, meanwhile, receives fitting tinkets worn by a TF2 class.
To get the bonus items, you'll need to buy Monday Night Combat for PC before 10am PST on February 1. The game costs $14.99, while a four-pack is a bargain $44.97.
Also kept under Uber's hat was a cameo appearance by webcomic Penny Arcade's fruit-loving Juicebot, who will sometimes replace Bullseye. See him in the launch trailer:
Sitting the Charlotte airport waiting for my flight to Nashville, got another 1 1/2 hours till my flight. At least there's free wifi.