The following is the changelog from our latest beta balance patch (this is not a live patch). It builds on the previous 3 balance patches that have also been posted here.
Berserker -
Increased fire rate to .67 from .75 on the Katana
Modified chainsaw and katana weapon categories to be in 3 and 4 respectively
Sharpshooter -
Gave discount on bolt purchases to the Sharpshooter - Up to 33% at lvl 6
Increased M14 head shot multiplier by 25% - From 2 to 2.25
Demolitions -
Increased discount on pipe bomb purchase - Up to 74% instead of 68% at lvl 6
Increased direct damage on LAW rocket hits - Damaged increased to 950 from 850, and radius reduced to 500 from 600.
Arming distance on LAW increased from 6 meters to 10 meters.
Reduced the cost of M32 nades to 10 to match m79