Valve released the details of the heavy achievements at the K.G.B.+Achievements page today. Still not the big Monday update we are looking for, but from looking through the acheievements we can see that the heavy will either get a new taunt or one of his exhisting taunts will be able to kill people, and possibly [...]

Today valve released the second heavy unlock, named Natasha. She does 25% less damage, but she slows you down while your taking fire. Sounds exciting, I’m glad to see that Valve is adding little tweaks to the weapons instead of dramatically changing the game.

Valve released information on the new payload map, Badwater Basin, today. Being that I love goldrush, I think this will be an awesome map to add to the cycle. Although, an underwhelming shove of community maps and one lame unlock is thus far putting a kink in my excitement for the Heavy update. Good time [...]

The Killing Gloves of Boxing (or K.G.B.) will give a heavy five seconds of guaranteed crits after he kills someone with them. This means you can keep punching and have a crit steamroll coming from his fists!
This is looking to be a MASSIVE update from valve, with seven new maps and even a new gameplay [...]

Looks like in the next week or two we should have our hands on a heavy update. Valve is realeasing information on the update in little chunks at The Heavy Update page.
Keep checking, hopefully some cool information will be popping out of Valve.