Well for those of you interested to find out i did find a link that T-Mobile is instructing Metro to do a generous buy back of CDMA phones for users in area's that are scheduled for Shutdown. Right now that is only Boston, Vegas, and one other Area. However the S3 if you return it to stock is set to give you a 199.00 credit towards billing or a new phone. So hang on to your devices guys.
As far as i have heard only 3 venue's have been slotted for early shut down of CDMA. Florida is still slotted for March of 2015. So if it stays true hang on to your tax refund. Of course by then the Galaxy S7 will be out..lol