First off, of the five engines announced for the Mazda3, just two of them are slated for the United States. At launch, the Mazda3 will be offered only with a naturally aspirated 2.5-liter four-cylinder...
The Skyactiv-X engine will become available later in 2019. It will be rolled out in Europe first, with America coming after. When it does come here, it will be offered in states with stricter emissions regulations before coming to other states.
While we're on the topic of engines, we also probed a bit about the possibility of the turbocharged 2.5-liter engine coming to the Mazda3. We did get the typical response of not being able to comment on future product. However, they did confirm that the turbocharged engine does in fact fit in the new Mazda3...
Now as for drivetrains, the company is still deciding which trims and which combinations of engines will be offered. Naturally, a manual has been announced, and with the 2.5-liter engine being the standard engine, that will be a combination for sure. The manual does indeed couple with the all-wheel-drive system, so that's a possibility, too. And manual and automatic transmissions work with the Skyactiv-X engine. So all combinations are possible, but Mazda is determining exactly which combinations will be offered.