Sometimes there is a need for a developer to respond to app reviews but there isn’t a way to do so. A recent leak of Windows Phone 8.1 will reportedly allow developers to respond to reviews users leave on their apps. This is said to be part of a feature that will let users flag inappropriate or offensive comments and those containing virus or malware. Another option in that feature is to report the inappropriate response to a review to the developer.
There is no confirmation yet about this feature but we might learn more about this (or not) at the upcoming Microsoft BUILD conference.
Source: Ubergizmo