The official Team Fortress 2 blog has word of the upcoming update to the heavy class. There are tons of additions in the pipeline:

• New game type (as yet unannounced) with five new maps
• New payload map
• New community made map
• Three unlockable weapons
• Thirty-five new achievements

An official heavy update site is revealing new information each day this week, as well as Monday and Tuesday of next week. So far, they've revealed the new community map (cp_steel), one of the new unlockable weapons (a pair of boxing gloves), and the list of achievements (though none of them have descriptions yet). As before, a free weekend will be held for folks new to the game. I'm looking forward to this update; it'll give me a reason to jump back into TF2.