This article ( http://www.theverge.com/2015/6/2/8704067/thunderbolt-3-usb-c-computex-2015 http://www.theverge.com/2015/6/2/8704067/thunderbolt-3-usb-c... ) expl

This article ( http://www.theverge.com/2015/6/2/8704067/thunderbolt-3-usb-c-computex-2015 http://www.theverge.com/2015/6/2/8704067/thunderbolt-3-usb-c... ) explicitly mentions an adapter for the older Thunderbolts. I assume the adapter would be passive.