Valve has released details on the new pyro weapons and custom maps to be included in the forthcoming update:
Flare Gun,
Back Burner,
Axtinguisher
The flamethrower also gets a nify new gadget standard,
"By hitting the alt-fire key, the Pyro is able to produce a blast of compressed air that knocks enemies away, and redirects enemy projectiles."
There are also going to be two custom maps in the official release, cp_fastlane and ctf_quarry!
Head over herefor all the info.