New channel Google Chrome Canary Build
Installation will not affect the current installation of Google Chrome, you cannot make Google Chrome Canary Build your default browser, it is available only for Windows. Lives its own life: its installation directory, is updated separately, can be launched in parallel with stable / beta / dev Google Chrome.
As the Canary Build developers say, the same thing as dev, it will only be updated more often, the version is higher than that of dev. Developers want to make the Canary Build update frequency almost daily.
From the Google Chrome Canary builds blog