"Victory begins in Tinker Town" and "every man, woman and child" is called upon to serve! The staging ground for the offensive will be at SteelGrill's Depot under the command of Captain Sparknozzle. There you will undergo Drill Sergeant Steamcrank's training. You will also be testing the Mechano-Tanks before they go to the front line. Then you will bomb the irradiation vents under the command of Pilot Muzzlesprock.
All levels will be able to participate, whether by donating boar skins for siege pilot seats or helping to write the battle cry. But the actual offensive, when ready, will be limited to levels 75 and up, led by the High Tinker himself. For full details, read the Azeroth Bulletin.