Just some input from someone not beta testing:
Keep in mind the hidden nerf to pistols due to the removal of the weapon reload mod effect for pistols, which was pretty darn useful, as the pistol was one weapon where reloading took a significant chunk of time compared to total firing time.
Perhaps the xp required for levels 6+ could be smoothed somewhat so levels arrive at a more regular pace.
A lot of the master traits seem to really pigeonhole a build. Even the new Cateye is a poor choice for any build besides chainguns.
Gun Kata looks very weak - even if it had no restrictions on it I wouldn't take it. Pistol shooting time is miniscule compared to all other actions for a pistol user, such as movement and reloading. Actually, if it granted a free dualreload (or even single reload) upon a kill, it'd probably be much better.
Actually among the master traits, there's only one I'm dying to try out, and perhaps two I can see as rather useful.