As far as I have known, and also read in the description of many apps on Google Play, it is not possible for publishers to respond to user's comments, but recently I have come across this:

Can someone give me more info on this? Also, if a publisher responds to my comment, how would I be notified about this? I do not see any Inbox or anything of that sort, also there's no option where we "Allow" Google Play to send up e-mails.