This again comes from the betatesters on the SA forums and here is what the weapons where when they where betatesting (Could change), but keep in mind this is a rumor.
Minigun- Does -25% damage but -50% run speed to whoever it hits (Would work with rumor that said that new minigun would harm Scouts)
Shotgun- A sandwhich that gives you 100 hp but can't attack. This is somewhat ridiculous, but would fit in. Fits the theme, the "popeye" rumor seems to work too, as well as it makes the heavy more viable without a medic.
Fists- Boxing Gloves that never crit unless you've killed someone in the last 5-10 seconds, then they always crit.
The "Arena" mode was said to change competetive TF2 forever. According to another source, the gamemode will be 5 v 5 sudden death style of mode, with weapon drops maybe?
KEEP IN MIND THIS IS A RUMOR. Now discuss.