Google announced today that they are dropping support for “Packaged Apps” or “Legacy Apps” in favor of “Chrome Apps”. Starting today, developers cannot upload any new packaged apps.
In December, all existing legacy packaged app listings will be removed from Chrome Web Store’s search and browse functions. Existing legacy packaged apps can be updated until Chrome stops loading them in June of 2015.
Here is Google explaining the reason for this change:
In 2010, we created packaged apps to fill a missing link between extensions and hosted apps. They look the same as a hosted app to the user, but under the covers, they are more like traditional extensions. Over time, we realized that a clearer separation between the Chrome browser and apps was necessary, both for security reasons and to conform to user expectations. We launched the next generation of Chrome Apps last year to address those issues, and today we’re announcing the deprecation of legacy packaged apps.