Summer of 05 means it'll be an 06, as sept/oct is usually when they release the new models. (Thus why the 05's are in production right now).
Btw there will most likely be...
1) Zero incentives. (initally)
2) No use of X, A, E, or S-plan. (initally, if not permently)
3) Dealer markups if the car even sells "slightly" well.
Mazdaspeed cars are LOW production, specialized vehicles. You have to WANT to get a mazdaspeed...its not like the other 30,000 produced mazda 6's you can just pick off a lot.
Quick production examples.
The first msprotege run was just 2000 cars. (Before the 2003.5's)
The total 1st yr mazdaspeed miata run is 4000 cars.
If you get any type of deal, its cause the dealer you bought from is an idiot. I'd expect to pay close to, if not higher than, MSRP if you want to buy one right when they come out.
Wait 6-8 months though, and they price will probably be a bit more sane.