Google has been steadily tweaking and refining their keyboard over the last few years, adding major functions like Gesture Typing some times, while other changes are relatively minor, such as todays update, which sees the Voice Input icon moved to the top of the keyboard out of the way.
Google Keyboard New
Google Keyboard Old
Version 3.1.19 of the Google Keyboard is rolling out to users now, but it may take a little while for the update to hit.
Source: Google Play.
I stopped using the google keyboard when the swype one became free. I like that I have a row of numbers above my letters I use it alot.