ChainfireXDA has done it again. He already has a work in progress root method for Android O Developer Preview 1. This will work for the Nexus 5X and Nexus 6P. Some have reported bootloops on the first release of SuperSU, but Chainfire has already updated it with a second test version to hopefully alleviate some of the bootloops that have been experienced. Before you jump and root your device running Android O you should consider the fact that this is only basic root and is still a work in progress. You may still run into some issues. At the rate Chainfire is going we should have a stable root available pretty soon for all devices running Android O.
via @chainfireXDA