No, 3; Jarate, the Razorback, and the Huntsman.
It was a double update, for the Sniper and the Spy. There has, however, been a Classless Update recently. It brought hats.
Each TF2 update comes out whenever Valve thinks of ideas, so just be patient
Sniper part
It is unknown as of yet.
It isn't said but thought to be in his 40-50's
its already out =P NOT FOR 360 *angryfaic*
Yes, have a look at the TF2 Wiki for exact information.
Haven't played Sniper: Ghost Warrior, but TF2 is amazing and now that it's FTP there's no reason NOT to play it.
yes, in fact, headgear was added during the first tf2 update, though there wern't many, valve has been adding more and more ever since and now its become a strong icon of tf2
They are designing a "training" mode for each class.
No, because the 360 isn't updated to the Mann Conomy update.
It is hard to say but in my opinion they at points did like payload and the characters like like sniper and widowmaker but this is my opinion.