Nothing changed from one year to the next. This is all part of the manufactuers recognizing that longer oil change intervals are fine with modern engines and modern oil. Both of them have improved greatly. Plus, reccomending longer OCI's can allow them to claim lower total cost of ownership, which is a comparison some people use. It takes into account fuel economy, maintenence and initial costs. Lowering maintenence costs can go a long way for that.

But there will always be people who figure that they need to change thier oil more often. My Father-in-law does his every 3000 kms.