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Mazda hard at work on Skyactiv 2 engine technology

As Mazda continues the current rollout of its still-new Skyactiv technology, the automaker is already looking at improving its family of engines for even better fuel economy and emissions reductions. Automotive News reports that with stricter fuel economy and emissions regulations planned for 2020 and 2025 in Europe, Mazda will likely release engines with next-generation Skyactiv 2 technology by the end of this decade, and Skyactiv 3 units just five years later.
The latter is expected to focus on improved engine cooling and lessening energy losses, but the big news in AN's report is that the next-gen Skyactiv 2 engines will use Homogeneous Charge Compression Ignition, or HCCI. This type of ignition is very similar to how a diesel engine operates (with high compression and using the compression stroke for fuel combustion rather than spark plugs), a method said to provide a cleaner and more efficient fuel burn - to the tune of a 30-percent improvement in fuel economy compared to current Skyactiv engines. Other automakers, including Hyundai, have already announced they are developing HCCI powerplants with similar technology and characteristics, so Mazda likely won't be a lone wolf here.
Equipped with HCCI technology, Mazda figures to be able to compete with larger automakers in terms of fuel economy and emissions without resorting to hybrid powertrains, continuously variable transmissions or automatics relying on more forward gears (eight or more) for optimal efficiency. Some of the challenges of HCCI, according to AN, include the need for better engine cooling, risk of misfire at high and low rpm and uneven engine performance based on fuel properties.

2015 Mazda2 revealed ahead of Paris debut [w/videos]

Small cars may be big business, but the world's automakers don't seem to be in any particular rush to keep them fresh. The new Smart Fortwo unveiled yesterday replaces a model that's already been around for seven years, and based on a structure dating back to the late '90s. The new Opel Corsa revealed just last week replaces a model that had been around for eight years. And the Mazda2 has been on the market in its current form for seven years now, but not for much longer because Mazda has finally revealed its successor.
Set to be unveiled at the Paris Motor Show this October, the new Mazda2 follows the stylistic lead of the Hazumi concept remarkably close, from the sharply creased front end right down to the wheel design - bringing the supermini hatchback in line with the KODO design language that characterizes its bigger siblings: the Mazda3, Mazda6 and CX-5.
Although details released thus far are rather limited, and power will vary from one market to another, engine options center around a 1.5-liter four in both gasoline and diesel versions, joining the manual and automatic transmissions and the chassis itself under Mazda's Skyactiv technology umbrella. We wouldn't expect the diesel version to make it across the Pacific (or across the border from the plant that will build it alongside a new Toyota hatch in Mexico), but rumors have surfaced of a potential rotary hybrid. The new 2 will also include the company's MZD connectivity suite and i-Activsense safety technology.

Mazda delays US launch of Skyactiv-D engine

Japanese automakers haven't lead the charge towards diesel power in the same way as, say, the Germans have. But Mazda is out to change that. It has been following Audi's lead on the racetrack with oil-burning racecars right here in America, and will soon translate that excitement to the road by introducing its Skyactiv-D engine in North America. It just won't happen as soon as we expected.
Mazda announced today that, while its diesel engine meets current emissions requirements, the company has decided once again to push back an introduction originally slated to kick off in the Spring. According to the brief statement below, Mazda wants to take more time to find "the right balance between fuel economy and Mazda-appropriate driving performance."
In other words, the Zoom-Zoom brand apparently thinks its diesel engine doesn't deliver the zoom-zoom American drivers would expect, so we'll have to wait just a little bit longer. Details to follow closer to launch, whenever that will ultimately take place.