although saying this - when you click to buy a macbook etc in the edu store it takes you to askin if u wanna purchase an ipod - and there are only the old ones visible.
BUT - on the rebate form it says you can have the "4GB iPod Nano"....so technically...... lol
I'm pretty certain that they'll be updating the FAQ in the next day or so - because at the moment, the don't actually sell ANY of the listed iPods, and they still have an ad for the deal on the UK store homepage.
Having said all that, I've had a good look at both the FAQ and T&C on the rebate form, and there are no SKUs mentioned - Apple would have a hard time refusing a rebate on a 4Gb iPod nano because you bought a 4Gb iPod nano instead...