Google testing blue 'instant' AMP label in the search results

Google is testing a new way to label AMP content in the mobile search results. Instead of using a gray AMP lightning bolt icon with the AMP letters next to it, Google is testing showing a blue lightning bolt icon with the word “instant” next to it.

This was first spotted by @Jonny_J_, however, I am personally not able to replicate it.

Here is a screen shot from Jonny:

Here is what I see, which is what you probably see as well:

Google is often testing different user interfaces — so this comes as no surprise.