Caches received an update to version 1.3 today. The notes in the app store boast Push Notifications for published caches. The feature works by issuing the user an email address which then needs to be registered at Geocaching.com and using the Geocaching.com notifications will then push the new cache to the app. The app is $3.99 in the App Store for new users and free for upgrading users.
Editorial Note: The push notifications is an appealing feature and the first which has me excited about this app. I've setup the address to receive the notifications for my local caches and hope to see the results within the next couple days.