With all this pyro stuff going on,
They could be able to light up the demoman's bottle to use as a Molotov that works like Spitter Cum Gew.
The flamethrower could be able to hold onto one projectile like the grav gun in HL2 while draining ammo, and can release them later on.
When a Sandman Ball is thrown, another scout can deflect the ball by whacking it in mid air.
Baseball anyone?
Scouts/Spies would be able to 'tag' enemies at melee range, letting teammates see their outlines through walls for a few seconds.
Sniper would be able to strap his jarate to his arrow, instantly Jarate'ing the area of where the arrow hit, but the arrow will drop faster, since its heavy :/
Homewrecker should instill fear in enemy sentry guns, causing them to not fire at the Pyro. (I would be scared if someone is running at you with a damn Sledgehammer)
(From SPUF)
Homewrecker would be able to knock off enemy sappers by using BRUTE FORCE.
Homewrecker damages enemy sappers now! YES!
Bunny Hat would let scout Triple Jump. (Quadruple with FaN)
Medic has AIDS syringes.
80% less knockback on Heavy, since he is... well... heavy.
Heavy's new taunt: Bearhugs an enemy, CRUSHING their insides, making their bones shatter into a million tiny fragments.