I think the S5 alone will kill the M3.
I could see the RS5 coming close to 100k if it tracks between the RS4 and RS6.
I wish this thing would come out already, it's the car I've been waiting for!
I would think that the S5 will be priced in the mid $50's; maybe I am too optimistic, but I can hope. If it is, I am getting one.
As far as the S5 being able to "kill" the new M3...well, sorry but either you're really blindly brand loyal or not too informed about cars. The new M will run circles around the S5. It will be lighter, have less parasitic hp loss due to having one less diff., have 60 hp more, better brakes and a sportier suspension. The S5 albiet, likely, a great car is marketed as a direct competitor to the 335xi, not the new M.
As much as I love the idea of the S5, it better be in the upper fifties or less, or the 335xi with better resale and a much lower cost of admission -with better gas mileage to boot- will be a better value.
Audi even claims only 5.1 0-62 when BMW is claiming 4.8 for the same run. It will get worse as the speed increases. And, the M will simply crush the S5 in the twisties.