Does anyone know if it is possible to unlock the New iPhone to work on T-Mobile yet?

yea it is possible to unlock it and use the T-Mobile.
you can use any sim card after you unlock a phone

Hi yes it is possible to unlock iphone to work on t-mobile network .I recommend you to visit Superunlockcodes.com here they ask you the network name to which your iphone is locked .Then at last they help you unlock your iphone using remote unlocking method.