Mike Blumenthal spotted that mobile searchers can now find a business using their mobile device on Google and add a review.
In the past, adding detailed reviews on businesses within Google My Business was not possible on mobile devices, now it is.
I tried it myself, here are screen shots. The image on the left shows that when you select the stars, it then automatically shuffles you over to the screen on the right, with the ability to add a typed review:
Mike even made a video walk through of the new feature:
So now you may be able to expect even more reviews on your business listing.
Forum discussion at Local Search Forums.