Likely won't make it into a saw any time soon but a really cool concept. Look at the 2 videos in the article. Smooth a silk. https://autos.yahoo.com/news/worlds-most-advanced-gas-engine-170021695.html
Similar concept except they eliminate the sliding contact of the pistons on a ramp or pivoting swashplate and replace that with their trick "reciprocator".
Neat video, but is old tech unless I am missing something. Check out a revolver cam engine.... I think there is plenty of technology for greater efficiency and power out there, but it's all about the $$$. Companies dont want to step on their own toes/profits, and make the most they can while big brother gets his $$$ to boot.