DAZ Studio 4 Advanced should be available for sale any day now, according to an official statement on their forums in early June. If you’ve already purchased the new Genesis figures’ auto-fit tool now (currently discounted to $80, it fits most of the old DAZ clothing to the new figure type), then you also apparently get $50 off either the straight or upgrade price of DAZ Studio 4 Advanced when it appears.
It’s not such a good deal, though. They’re doing it because they’ve made a decision to include the auto-fit tool in the Advanced version. You’d be $30 down on the deal, if you’ve already bought the auto-fit tool and then buy DAZ Studio Advanced. It’s best to hold off on buying DAZ Studio plugins until it’s known what’s included in Studio 4 Advanced, I’d say.