GPS makers Garmin and TomTom both produce their own fitness apps as side-gigs, and now Nike+ integrates with them both. Either partner's runs will automatically appear inside of Nike+ Running. You can find the information under your activity history.
This release also includes auto-pause, which pretty much does what the name says. Your runs will automatically pause and resume when you stop moving. If you don't like it, you can toggle this option in the app's settings. Or you can keep running forever so that the feature never has to take effect.