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CocoonJS isn't ready to use production until 2013, its features are:
Ad network integration. There are multiple services that allows integration with some of the main ad networks in both iOS and Android platforms to show banner, interstitial and video ads.
In App Purchases (IAP). There are services for both iOS and Android IAP support.
Analytics. Cocoon supports app tracking via third party SDKs or even server to server management.
Multiplayer infrastructure. We already have both GameCenter support for iOS devices and our own backend infrastructure.
Online resource update. Our applications can update their resources (images, sounds, texts, configuration files) online without having to create a new app version.
Access to device hardware specific features like the camera and the GPS.