“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 equpped. “Info

Beyond the current the problem of everyone on the pub servers currently playing medic, now the Ubersaw is being used as it’s named implies, literally as a Uber weapon.

*Video not by me, music NSFW

For those who don’t follow whats happening, it takes 4 hits with the Ubersaw to recharge your Ubercharge, and you can recharge your Ubercharge while being ‘ubered’.
Hence, two medics who constantly flick ubers between each other are now a pretty lethal combo.