The three new Medic weapons are.
The Blutsaugher
For players that earn one third of the 36 new medic achievements, they will be given a new syringe gun. Called "The Blutsaugher," this new weapon no longer has the ability to score critical hits against an opponent. Instead it will draw health from enemies each time a syringe hits. Especially useful as a weapon to retreat away from the fight while staying alive.

The Critzcrieg
Once a medic has earned two thirds of the achievements, they will be granted "The Critzcrieg." This new medigun uses its ubercharge not for invulnerability, but to give its recipient 100% chance to fire critical ordinance. Medics and the player they are charging need to be careful though, because as much fun as it is to fire critical rockets as fast as you can, the other team will see what you're up to and try to put a quick stop to your plan.

The Ubersaw
For the determined medic that has earned all 36 of the new achievements, they will find themselves the proud owner of "The Ubersaw," which will take damage done in melee attacks and convert it directly to ubercharge. Four hits with this new weapon will fully charge whatever medigun the medic has equipped.
Source
http://www.shacknews.com/onearticle.x/52236

While I like the first two and think that they can be balanced as of now I have no idea how they are going to balance that ubersaw. Unless they completely remove crits from it, it will be way overpowered.
What do you think?