It's back! Was in Bunnings yesterday and there was a Dewalt stand advertising this. They told me I could trade in any old cordless skin (guess they don't want to have to dispose of the battery) for a select number of new skins (not a lot of choice unfortunately).
So I traded in an old cordless drill (worth $0) that I was about to chuck out (it ran on Nicads so tells you how old it was).
EDIT: I forgot to mention that you also get your 5% powerpass discount off the price of the tool (before the trade in discount kicks in)
This is an awesome deal.