Difference between a Packaged App and a Legacy Packaged App in Chrome

Question

Basically packaged apps do not appear on the Chrome App Store, but legacy packaged apps do. The documentation states that

Warning: All content in this doc refers to the legacy version of packaged apps. Your legacy packaged apps will still work, but you won't have access to any of the new APIs. Check out the new version of packaged apps; otherwise, you're missing out!

The question is, what will you be missing out when using a legacy packaged app instead of a packaged app ? (apart from not appearing in the Chrome App Store)

Answer 1

Better window geometry control (open outside of the browser), security, access to more powerful APIs, etc.

See http://developer.chrome.com/apps/about_apps.html