I read on touring plans blog earlier that they will be able to be used at all resorts regardless of where they were bought.
http://blog.touringplans.com/2013/0...able-mug-system-coming-for-walt-disney-world/
According to a few reliable sites, including wdwmagic.com, a brand new version (called Rapid Fill) of the ever popular refillable mug system is expected to be rolled out starting this month. Over the next few weeks at all Walt Disney World Resort hotels, the changeover will take place with the introduction of new mugs that are equipped with a Radio Frequency Identification chip (otherwise known as RFID).
The new mugs will be activated for a specific number of days: either one, two, or three days OR for the length of stay (which is good for 14 days; if your trip is longer, you can purchase more days for the mug). Guests can check to see how many days remain via the beverage dispensers LCD screen. Once the purchase period is over, the mugs will be deactivated and cannot be used on subsequent visits. These mugs will be allowed to be used at any resorts beverage station, regardless of where it was purchased, during the mugs life.
All guests can purchase a mug, even those who are not staying on property. Once the mug is activated at a beverage station, that will start the first day. The day ends at 11:59 pm, no matter what time you first activated said mug.
The price for the mugs will vary based off the number of days that are purchased.
$8.99 for 1 day
$11.99 for 2 days
$14.99 for 3 days
$17.99 for length of stay (4 or more days)
The refillable mugs will still also be included in some Disney Dining Plans. Past mugs may not be reused.
These mugs are set to roll out starting at the All-Star Resorts, then to the rest of the resorts subsequently.
This has not officially been announced by Disney yet, so some details may change.