None.... as far as I'm aware. The best they could offer was a 'fair' if not good part exchange on my current ST, which I was quite happy with. For reasons unknown to me, I was informed by the stealer that supply will be limited to two allocations per dealer for the first couple of months.... consequently they were in no rush to offer any discounts. However I'm sure things will change, once they ramp up production. Give it a few months, once all the hype and publicity has died down.
Hopefully mine is due sometime in June.