Jetpack 2.0 was a major update with tons of new solid features. WordPress.com developers have now released a bug fix edition.
Jetpack 2.0.1 is now available as an update for all existing users. Changelog mainly consist of bug fixes and some user suggested improvements:
Avoid distorting images that don’t have explicit width and height set, or that only have one dimension specified.
When images are linked to their full-size versions, also serve the full-size versions from the WordPress.com CDN.
If an image is already processed with Photon, don’t reprocess it.
Add support for the Lazy Load plugin.
If a site has custom shortlink settings, use those rather than always using wp.me.
Disable the Publicize interface for any posts already publicized to reduce confusion.
Link to connected LinkedIn profiles on the connections screen.
Improve error handling.
Child themes now support Infinite Scroll if the parent theme does.
Archives now properly load only posts that would be shown if Infinite Scroll wasn’t present.
Link to support documentation within the module when the active theme doesn’t support Infinite Scroll.