Facebook Testing Redesigned Left Sidebar and Login Page?

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Today I noticed Facebook has redesigned its left sidebar. A cleaner and simple look.
Here’s the screenshot:
facebook_new_sidebar

The new sidebar is similar to that of rolled out with the new newsfeed. It was was one of the major update to Newsfeed redesign, merging both navigational elements and Facebook’s chat features atop a smooth, slightly pushed back dark-gray background.

newnewsfeed_sidebar
Left sidebar rolled out with redesigned Newsfeed

Another change I noticed that, the new Facebook’s Login page. When I opened up Facebook this new login page has been appeared:

Facebook-new-logn-Page

 
The new design of the login page is similar to that of Instagram – a montage of images as background and a restyled dialog box where you enter the data credentials.

Have you seen anything similar?