To be honest, I don't know why this didn't come sooner. Google themselves have leaked what looks like the Google Now widget. It was found on a Google support page, now the page has been pulled unfortunately.
From what it looks like the widget can support many different types of information available through Google Now, such as maps, scores and weather. This is definitely a great step forward because widgets play a huge role in Android, it's what sets it apart from many other mobile OS'. This widget will also make it a lot easier to look at Google Now information quickly, no having to load up the Google Now app every time.
No one knows when the widget will be available. But I'm hoping it's very soon and not at the next Google I/O which is months away.