Hi, All templates (compatible with Jomsocial) have already been updated to be compatible with Jomsocial 2.8 and even with latest version of Jomsocial 2.8.4, however, if you are a subscriber, you can download the updated template and source files and follow instructions to upgrade your existing website.
However, it is strange that this update is not mention in the service update area of the template Musicity, gavick developers should update the road map with latest updates I guess.