The last minute change to Battlemaster Expertise for 1.2 does not transfer if you swap the mods out to other gear for pre 1.2 Battlemaster. If you currently have Battlemaster from before 1.2 and want to swap out mods for customizing gear, it will not bring with it the giant boost to Expertise they added before release.
DO NOT REMOVE THE MODS FROM YOUR CURRENT BATTLEMASTER GEAR TO CUSTOMIZE OTHER GEAR!
You will seriously gimp yourself. No word yet if this effects the new Battlemaster yet. But those on right now moving mods off Battlemaster are throwing keyboards.