According to a pasted e-mail from VALVe on the official Steam forums, the development team has scrapped the Medic's proposed Overhealer alternative unlockable weapon.

Citing balance reasons and in response to one poster's concerns about the viability of melee-oriented Pyros, it looks like the tentative gun that was slated to permanently double a teammate's HP won't be making an appearance.

This is great news, in my opinion, since doubling the HP of any players would kill classes that have alternative combat tactics (Pyro, Sniper), but it only begs the question... what will the promised Medic unlockable weapon be? 

Some ideas:

• Electric Bonesaw
• Defibrilator
• Syringe Rocket