The new version includes additional options for managing your groups and several new moderation tools to make managing your forum easier and faster. You can also browse and moderate your groups from your mobile device.
One of the recently improved features is the ability to create an inbox that allows you to collaboratively share, distribute and track responsibilities with others. Imagine you and a few friends are organizing an event for your school and want a single email address to coordinate with vendors, parents, and volunteers. Members of the group can work together to manage email, assign items to each other, and mark items resolved. This can be a great feature for teams seeking a really simple way to get things done without sharing passwords or losing track.
More details at the link below or click here for the Google Groups homepage.