Well, it should be released today if all goes according to plan! Based on all the information at http://www.steampowered.com/tf2/heavy/ I think it looks fairly promising, I especially like the new map style that's been introduced (in the Arena Mode link). On the subject of Arena Mode, it looks like this is a really team based game mode, it will be interesting to see how it works in public servers.
I'll be on tonight to test the update and everyone else remember there's a free weekend coming up!
Gimme a sign on steam Lee and i will join you..:)