If you buy one of the new Nexus devices – the Nexus 9 or Nexus 6 – and plan to unlock its bootloader upon first boot, so that you can get to tinkering, understand that you may have to enable the “OEM ...
You waited and waited and finally got a Nexus S. Given the history of other phones you figured it would be a week or so before you could unlock the Nexus S, and another week before you could root it.