Updated: January 28, 2019
New Google Sites rolled out to all G Suite customers in November of 2016.
The original Google Sites, now called “Classic Google Sites” was released in 2008 after the acquisition of JotSpot in 2006. The product did not see much in the way of enhancements for many years.
The new Google Sites was built from the ground up, which means not only a modern set of design components and full device responsiveness, but an app that fits in much better with the rest of the G Suite offerings.