It says on the TF2 wiki that the Hadouken taunt does 1 damage, but maybe they'll change that, or add a new taunt with one of the new weaps that does damage.
Also, another update, some good news and bad. Bad first: Pyro cannot air jump, Robin Walker says they experimented with it, but it just wasn't as fun or practical as it seemed.
Good news: unlocks are tied to achievements, yes, however, you only need 15 for the first unlock, and then 5 for each subsequent unlock. So, new weaps at 15, 20 and 25. \o/
Maybe we won't need to farm these after all