Notifications adds a menu to your toolbar that lets you read, moderate, reply to comments from any page on your blog. Plus, if find yourself on TechCrunch, GigaOm, or any of the millions of other sites running on WordPress.com, you’ll be able to view and moderate comments on your own site from the toolbar there, too.
Mobile Push Notifications for iOS: Users who link their accounts to WordPress.com and use WordPress for iOS 3.2 can now get push notifications of comments.
Custom CSS can now be applied to mobile themes.
The WordPress.com REST API is now available in Jetpack. That means developers can build cool applications that interact with your site, and applications built on this API for WordPress.com can now work with Jetpack-enabled sites, too.
The Contact Form has been overhauled to fix incompatibilities with other plugins, and Sync has been improved to ensure consistent data from your Jetpack blog is available in your Site Stats. For a complete list of bug fixes, see the change log.
Jetpack 
But when will the subscriptions allow us to send just an excerpt and not the whole damn post???
Thanks. 🙂
J.
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Actually, that’s one of the things that has been updated in this release. Jetpack uses your existing feed setting to control this, so just make sure that your settings are configured in “Settings > Reading > For each article in a feed, show (Summary)” and your subscribers will receive the excerpt you wrote, along with a “read more” link back to your site.
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The Dude abides Jetpack.
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cool
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Reblogged this on gibrown> and commented:
In addition to a notifications system that spans across WordPress.com and WordPress sites with Jetpack installed; the new Jetpack also has a great JSON API.
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Interesting. Will there be instructions for those of us who are not as computer savvy?
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Check out the Support section: http://jetpack.me/support/
Let us know in the support forum if you hit a snag:
http://wordpress.org/support/plugin/jetpack
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Reblogged this on Egill.
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Reblogged this on Joey Kudish and commented:
Pretty significant Jetpack update out today. Exciting things coming from Automattic for self-hosted WordPress.org sites!
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Thank you for further developing & releasing new versions.
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Nice one, I love jetpack 🙂
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Does this mean Klout works with WordPress installations now?
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Yes, it does! Just choose your linked Jetpack blog from the list as you would a WordPress.com blog.
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Keep up the awesome work guys and gals – jetpack is making everyone’s life better 🙂
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