Typically, Google has been showing a light gray AMP logo in the search results to show off which pages will load using the AMP technology. In this test, Google is going bold and dark with this new look.
Here is a screen shot from Aleyda Solis:
Here is her tweet:
AMP icons in SERPs have become more visible now ð”± pic.twitter.com/C9JmJenuSz
— Aleyda Solis (@aleyda) July 16, 2017
Google is constantly testing stuff, so will this stick? I am not sure but more and more people are noticing the new black rounded corner design. The darker AMP logo? I am not sure.
Forum discussion at Twitter.