Just a little thing about , as we have been finding out to our surprise since it was released here.
Currently when you activate a facetime call it actually sends out a SMS message to a server via 'cellular data'. Regardless of the fact that you have to run it on Wifi officially.
Therefore the chances of facetime being available on the new iPod unless they change the current way face time operates is pretty low seeing as though it doesn't have cellular data, hence can't send the SMS to the server.