This feature will be available to all users, across all plans, providing your admin has enabled Beta Mode.
Theme Discovery is a new feature in Beta Mode that presents users with the key themes and topics being talked about in your feedback.
Simply head to the 'Discovery' tab in the Feedback section, and you'll see the most talked about themes symbolised in different sized circles as seen below.
Once you click into the chosen circle, you'll then be taken to the feedback associated with that theme. From here, you can then filter the results and make any changes with the bulk edit functionality.
As mentioned, this is an early version of the feature, so please do share your feedback on how it's working for you here!