The reply I got from WDW was that "the rumor was just that, a rumor". There will be no bar coding system going into effect at the resorts. Im not saying there wont be, but that what I was told.
The CM also said while the "official official(said sarcastically) thing(yes she said thing, not policy)", is that they are good for the length of stay only, the unofficial policy of the resorts is if the guest has a mug, it can be refilled. So, from her answer I got that somewhere in the big wig offices, the rule is length of stay only, but the resorts have made their own rules.
So, from the message I recieved it sounds like nothing has or is going to change in the resorts.