As if hardcore TF2 players weren't refreshing the hell out of their machines, Valve have nonetheless shot through a reminder that the Engineer Class update is available now, and will be applied automatically through Steam for Team Fortress 2
. This is the largest single class update the team have done, and it's been coming for a while.
As a non TF2 player (I just don't have the time, and am scared), I'd rather not attempt to relay the changes to the class or game, and instead will just link you to the official update page, which in typical Valve form, showcases everything in comedic and artistic style.
Click here for the full run-down