We'll be streaming live video from the launch in New York from 4.15pm tomorrow.
Also on show will be Mazda's Minagi concept car and the newly redesigned Mazda 3.
The Skyactiv technology includes completely redesigned, highly efficient petrol and diesel engines, manual and automatic transmissions, and an advanced body and chassis. The Minagi and the Mazda 3 will both feature the new technologies.
Here's the info on the event:
What: Live webcast of Mazda unveiling its Skyactiv technology
Date: Thursday April 21
Start Time: 16:15 BST