Mazda Roadmap past SkyActiv-X
 

their roadmap
https://cimg7.ibsrv.net/gimg/www.rx8...6207858a3f.png

and their view of car propulsion tech going forward


https://cimg3.ibsrv.net/gimg/www.rx8...52f1195eec.jpg

from https://www.autoblog.com/2018/01/26/...id-ev-roadmap/

looks like gasoline is still king till the late 20s