To do this, Pocket has created various APIs to make it easy for other developers to add a "save to Pocket" option. Not all platforms offer a universal sharing menu like Android, and that actually includes the new Android Wear. Screen real estate and interaction limits on a smartwatch necessitate a more focused set of options. So, Pocket has created an API to let developers more easily add a "save to Pocket" option in their Android Wear apps. Like most functions in Android Wear, the work isn't actually done on the smartwatch itself. The button will just initiate the action on your smartphone.
This sounds like a great idea, but we do hope that developers use it in the right ways. Not every app will need this added, especially given the usage that makes the most sense on a smartwatch. For example, in the demo that Pocket has shown the new button on a notification of a tweet, but Twitter seems like a service that would simply overwhelm a smartwatch display.