The Help pane floats over the top of the Google service you're using, and provides a quick, convenient way to (hopefully) bring up relevant Help Centre articles and essentially get the answer you're looking for. This has been around for a couple of years but the look and feel has remained the same until recently, when visually refreshed versions incorporating Material Design started rolling out across a couple of Google products, and Google+ is the latest one to get the good stuff.
Old Help |
New Help |
To check the update out for yourself, bring up the navigation menu (hover your cursor over "Home") and you'll see a small "Help" link underneath Settings. Click that and you'll have access to the Google+ Help Centre from the comfort of your Home stream.
Does that mean we're one step closer to getting a Material Design makeover for the desktop site? Not sure, but I hope so!