KD:
I singed up for a lease on a GT here in Montreal, and the rate is the same at 8.9%. I was just lucky that the dealer singed just at MSRP and not more...
As for any manufacturer, cars that sell like hotcakes never get any incentive or preferred rates. As you know, Ford offers 0% financing on almost all its other products. I have not looked at bank financing for the GT though since I'm not buying the car, but it could be the alternative. And under the current situation (i.e. there's a wait list for GTs!), I don't expect Ford to offer any incentive before 2006, except maybe on the V6.
Oh - one more thing: it seems that the residual is fairly low after 3 years, which does make the lease even more expensive (I got quoted a 52% residual after 3 years, while I have exactly the same residual value at the end of my 4 year Acura TL-S lease!).