I know I don't post here often (this isn't exactly my favorite forum), but I have been closely following Mazda's updates about everything SkyActiv. The SkyActiv-G gasoline engine was first previewed by the Minagi concept, but was put into the existing Mazda3's engine bay to boost fuel economy numbers and get the word of SkyActiv out to the public. The CX-5 is, in fact, the first "ground up" SkyActiv vehicle, as stated in an earlier post. It is based on the Minagi concept and also the first vehicle to show Mazda's Kodo, or Soul of Motion, design language. The 2014 Mazda6 is based on the Takeri concept and is the second "ground up" SkyActiv vehicle in Mazda's arsenal. It will launch with the same SkyActiv-G gasoline engine that's in the Mazda3 and CX-5. Since 2014 is also the expected year of Mazda bringing the SkyActiv-D diesel to the US, there's a good chance the new Mazda6 will receive that engine as an option. It may be made available in the CX-5, as well.
Since the CX-5 debuted with the "basic" SkyActiv technology and the Mazda6 will incorporate i-ELOOP, then it may be safe to expect Mazda's next Kodo makeover to receive i-Stop. i-Stop is an advanced engine stop-start system that stops the engine with the pistons at their halfway point. Fuel is then injected into one of the cylinders to start the engine as soon as the brake pedal is released. This allows for quicker, smoother starts than other systems that use the regular starter to bring the engine back to life.
I feel like I rambled a bit, but hopefully cleared up any confusion as well.