The Vonage CLI is in beta, offering a new plugin architecture that allows for modularizing packages better and enabling additional use cases and functionality. The CLI was built using oclif and Lerna to support multi-package repositories, making it easier to version and deploy plugins. The beta version can be installed using npm and offers various features such as authentication setup, In-App Conversations, and Users plugins. The developer advocate encourages users to test the CLI, report issues, and provide feedback to help improve it for v1.0.