There's not a lot to look at, but the minimalism is part of what makes is great. We're talking about Google Now, and the fact that reference to a widget has appeared on a Google support page answers the prayers of many an Android fan. There isn't a lot of documentation, but very little is needed. Place the widget on your homescreen just like you would any other, and a click on one of the sections will open the relevant parts in Google Now. We assume that the widget will be populated based on your Google Now card preferences.
There's no word on when we'll see this, or if it will be part of an OS update or an update available via Google Play. We're guessing the latter, which makes it readily available for carrier phones that might be, shall we say, an OS version or two behind. We'll just have to wait to get the full details.
Update: Looks like Google's pulled that support page.