Mobile G-Sync

Nvidia today announced today, mobile G-Sync coming very soon for selected GPU 900 series. My question is will the current 900 series get this G Sync feature ( Software update) or Are the new laptops coming with G-Sync going to have a hardware G-Sync on there GPU?

I want to upgrade my GPU to a 970m so i am wondering if this is a softwear update or hard ware update on there 900 series GPU.
Check out the following link

http://goo.gl/TvmjmR

http://goo.gl/dmEVhr