I just read this about the MX-5 on the Cars.com new car preview....
"The MX-5's 2.0-liter four-cylinder develops 170 horsepower at 6,700 rpm. The engine operates with four valves per cylinder and has dual overhead camshafts and variable valve timing. Torque output is 140 pounds-feet at 5,000 rpm. Three transmissions are available: a five-speed manual, six-speed manual and six-speed automatic. The six-speed manual has especially short throws and triple-cone synchronizers for the first four gears. The engine's output dips by 2 hp when it's teamed with the six-speed automatic."
If I remember correctly the Solstice has 177HP at a lower RPM and according to the factory it develops 162 ft pounds of torque, (the more torque you have available at a lower rpm the better for acceleration) most of that is developed below 2400rpm, wihch means the Solstice should give the MX-5 a pretty good run in the 0-60 stop light challenge... which is also better for running road courses, with low speed turns, depending or the gearing, which I have not seen we still may be competitive with the lighter MX-5.. But this is all speculation, I bet some car magazine is already contacting both GM and Mazda to have a head to head test... I can't wait to see what happens...