Realtime Worlds' lead system designer JerichoNA, posting on the official forums, pre-emptively addresses concerns players might have regarding the testing and implementation of weapon tweaks such as these. "It''s not simply as a concession to people raising concerns on the forums. When weapon balance issues come up, we correlate these with feedback from our QA department and from team members who play regularly on the live service," he writes.
In addition to the weapon tweaks, criminal vs. criminal matchmaking has been disabled, as have been system-generated bounties. The full patch notes will be available this Tuesday. In the meantime, check out the details on the official forums.