Google has been redesigning almost all of it's pages. And I really don't mind the change, the interface is a bit sleeker than before. Like many other pages, the Gmail has also changed the look, but it isn't activated by default. To activate the new look you have to log-in to your Google account, and then go to your name at the top right and on the drop-down menu select Account Settings.
Now on your accounts page, go down to My Products list and find gmail and next to it is an option : Settings. Click that.
After that, you should be on the Gmail Settings page. Now on the settings toolbar , locate the Themes option and click it.
Now go all the way down and you should see two themes called : "Preview" and "Preview ( Dense )". Select which one you want.
After that you should now have the new Gmail interface with I really like, I hope you also like it. I personally think Google is doing a great job with the redesign. But who am I to judge, leave your opinions on the comments area below.