When the RFID chips become active, re-using old mugs will not be possible. So it will end the debate regarding whether you should re-use them or not.
And yes, they cannot be microwaved because of the RFID chip. Don't know if that is because the chip won't work, or because microwaving the chip could cause damage to the mug or the microwave. I have no idea if they're metal or have metal in them or what.