“The feature originally rolled out to top developers, and we’re gradually expanding it to additional Google Play developers,” a Google spokesperson said.
The feature first launched for top developers in June 2012, and now all developers are getting the privilege to reply to users’ comments.
Google has not officially unveiled this new functionality yet, but has instead quietly allowed devs to get in touch with users. For developers this is a chance to improve on an initially bad rating of apps, and thus polish the image of their applications. And it’s a big one as a lot of people take decisions on apps based on their user rating.
source: Droid-life, The Next Web