Potatoe, Potato.
Wish we'd get the diesels... still have to wait and see if Mazda finally gets a programming fix for the oiling problems people are seeing elsewhere... but I do believe it's only a matter of time.
As rooster notes about the Malibu, the SkyActiv system would also be so much better if the engine could go off while coasting. Could be another 1-2 mpg EPA from that. Plus you need to fulfill a very strict set of conditions for the motor to turn off at a stop. Any steering angle (waiting at a ramp, or stopped in the turning lane) and the motor won't go off.
If Mazda releases a SkyActiv system with a kill switch, or if someone hacks it so that you can use the start-button to toggle i-Stop, it'd be as perfect as an ICE-only system gets.