How To Put Jetpack Into Development Mode for Local WordPress Installs
Jetpack’s Development Mode allows you to use features that don’t require a connection to WordPress.com so that you can use them in testing. Activate it by adding this define to your wp-config.php file:
{code type=php}
define( ‘JETPACK_DEV_DEBUG’, true);
{/code}
This is very useful for when you want to test out new features on your dev install before pushing them to your production site. Just remember to remove the line if you move the dev site to the live environment.
Also new in Jetpack 2.2.1 is the ability to filter shortcodes and widgets. Check out the release notes for more informaation.