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Kint 3 bumps the minimum requirement up to PHP 5.3, comes separately in a phar file, and now uses namespaces.
The facade has been heavily rewritten to make it easier to reuse instances of Kint for performance.
kint-php/kint-js and kint-php/kint-twig have been updated to match Kint 3, with kint-twig making heavy use of the new facade features
The rich renderer now sends dumps to a folder docket at the bottom of your browser by default. You can turn this off with Kint\Renderer\RichRenderer::$folder = false if needed