I'll do a little more research but by looking at the article below which was posted in Oct 2013 I'd say their hybrid is fairly new. I haven't been able to find anything to say for sure when they were first Manufactured.
Whether it's because of their innovative Speed-Feed technology or their two-year, commercial warranty, Shindaiwa's products are chosen consistently by professionals for the hardest jobs. They also offer two different choices of engine technologies--a reliable 2-stroke, and their brand new 2-stroke/4-stroke hybrid fusion. This hybrid technology is Shindaiwa痴 initiative to join the green movement. It offers lower emissions, decreased fuel consumption, lower sound, and higher torque. This allows even the shrewdest of consumer to purchase and enjoy a long-lasting Shindaiwa product.