https://www.cnet.com/news/youll-have-to-use-the-new-gmail-in-october-whether-you-like-it-or-not/

Odds are that you've been using the same version of Gmail for the past few years, but Google is coming out with a new version of Gmail that looks and feels very different from the current one (though with features reminiscent of Google Inbox). It's got new buttons, new "hover actions" and new features like the ability to snooze an email (like hitting snooze on an alarm clock) to have it pop up again later, and "nudges" that'll point you to emails you may have missed. 

These changes could be seen as awesome or confusing, depending on personal preference. And if you don't like them, you won't be able to push them away for very much longer.