Google this morning started rolling out a minor update to its Keyboard app on Android. The update bumps the app to version 3.1.19 and is pretty small. The only notable change is that the Voice Input button has been moved to the top row of the keyboard, on the right side of the auto-complete suggestions. Previously, the button was located next to the spacebar. This change is definitely useful, as many users would previously accidentally tap the voice button when aiming for the space bar.
The update is available on the Play Store now, although it is rolling out slowly.