According to my Blogger Stats and GA, it appears that a lot of people here use Google Chrome. If you fired up your browser today (or even yesterday, I'm not sure) and discovered that there is a slight change in the browser, you were correct.
While this is not that much of a big issue, Chrome now appears to have a different icon in use for its settings/options menu. Previously, the icon was a simple wrench. Now it appears to be a menu like icon. Not sure how to exactly name it.
I would not pay too much attention to this, because there was simple modifications such as the size of the new tab button, and those changes were reverted. Here is some proof of what I am seeing. If you are seeing something different, then please attach a screenshot to a comment and please let me know.