There was a reoccurring theme throughout WWDC 2014 and that is expanded support for what third party developers can do in iOS 8. To name a few:
- Inter app communication. This is huge. Now you can install a 'plugin' in Safari. In the demo, they showed how they used Bing for translation. Pinterest in share sheets.
- Interactive notifications
- Support for third-party application widgets in the Notification Center
- Support for third party systemwide keyboard replacements.