Chrome's intent to experiment with Web Bluetooth

Chrome has announced an 'Intent to Experiment' on blink-dev:
https://groups.google.com/a/chromium.org/d/topic/blink-dev/coyvHj1u2Z8/discussion

What does it mean to launch an 'experiment'? See:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/wWYJ2voVEKc

In summary: In summer this year sites will be able to obtain a key that
will enable the feature for users of Chrome, without requiring any
configuration (e.g. command line flags). The experiment is time limited,
see above for details.