It seems that the Tribal operated Foxwoods Casino has entered into some agreement with MGM/Mirage to have a separate gaming facility (building) adjacent to the Foxwoods casino that will be managed by MGM/Mirage and called the "MGM Grand at Foxwoods".
The MGM facility is now up and running and is connected to the Faoxwoods casino by a covered walkway. It is unclear to me if there are restrictions on what chips can be used at which location, but both locations are releasing new rack chips.
Here are scans of the currently available new chips. I will add images of other to-be-relaesed chips in this OP when they are available.

(scan courtesy of Chris Sevick)

(scan courtesy of Chris Sevick)

(scan courtesy of Chris Sevick)

(scan courtesy of Chris Sevick)
Chris Sevick, a memebr of the CC>CC is an employee of Mohegan Sun and regularly posts updates of Foxwoods and Mohegan Sun happenings on TheChipBoard. There will be additional chip releases coming up as the "official" opening date of the MGM Grand at Foxwoods is set for May 17th, a month from now.
Jim (Gaming Ore) Follis