New plugins are released on a periodic basis as new security controls are added by the CSPM team for existing or new cloud provider services. For example, after the AWS Lambda service was released, CSPM released several plugins related to Lambda over the following weeks. 

While there is not a pre-defined schedule, CSPM does announce new plugins approximately 1 week in advance.
Sign up for notification about the addition of new plugins, which can be subscribed to from the “Account Settings” page.