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What exactly is Canonical Plugins? WordPress.org explains

Canonical plugins would be plugins that are community developed (multiple developers, not just one person) and address the most popular functionality requests with superlative execution. These plugins would be GPL and live in the WordPress.org repo, and would be developed in close connection with WordPress core. There would be a very strong relationship between core and these plugins that ensured that a) the plugin code would be secure and the best possible example of coding standards, and b) that new versions of WordPress would be tested against these plugins prior to release to ensure compatibility. There would be a screen within the Plugins section of the WordPress admin to feature these canonical plugins as a kind of Editor’s Choice or Verified guarantee. These plugins would be a true extension of core WordPress in terms of compatibility, security and support.