What exactly is the deal with slide-out sidebar navigation? Is it a standard Holo thing? Is it not? 3rd-party developers aren't really sure what to do with it, and even Google-made apps are all over the place. Some apps have sidebar navigation, some don't. The ones that do have it all function a little differently and none of the implementations were actually any good - until now.
Can we be honest with ourselves for a bit? Notifications on Google+ have sucked for a while. It's never clear what's new and what's old, they're cluttered with information, and up until recently, they've been tucked away in the app underneath the sidebar navigation. Well at least one of those problems is getting fixed today as the Android app gets an update that creates a special new section for notifications on the right-hand side of the app.