
The updated Android Device Manager app (v1.3.8) can be downloaded for devices running Android 2.3 or higher from Google Play. Apart from bug fixes and performance improvements, the updated app now allows users to set a call back button on the lock screen of their lost or stolen phone.

While Android Police reports the call back option is 'basically limited to phones, for obvious reasons', it should work on tablet devices with a voice-calling feature.
Android Police also found evidence of possible future Hangouts integration to the call back feature in the code of the updated Android Device Manager app.
Now, Set a Call Back on Lost Smartphones With Android Device Manager | NDTV Gadgets