The new design features a fly-in menu on the left which replaces the tab system that Gmail got last year. There is also a collapsible Hangouts interface on the right.
This setup lets you open everything up if you’re a fan of using the whole display for your email, but it also supports shrinking the window down so you can glance at your Inbox whenever you need it. The bars that stretch across the display look a a little awkward at first, but when you keep in mind how much information can be displayed in those bars it is a setup that could prove useful to anyone who needs a more detailed scan of their Inbox when hunting for something.
Circular buttons to create a new email or reminder are located at the bottom right. There's also a new pin system that replaces stars. A toggle at the top of the UI can be used to drag your pinned emails to the top.
There's no guarantee that these features will make it to public release; however, you can check out the new layout in the screenshots below...