It can't do reminders when you are around people yet but there have been clues[1] that it's coming found when poking inside the Google Search app. It's expected

It can't do reminders when you are around people yet but there have been clues[1] that it's coming found when poking inside the Google Search app. It's expected to make use of the leaked Google Nearby[2] which will "...periodically turn on the mic, Wi-Fi, Bluetooth, and similar features..." to aid with proximity. 1. http://www.androidpolice.com/2014/03/17/rumor-remind-me-when-im-with-this-person-may-be-coming-to-google-now/ http://www.androidpolice.com/2014/03/17/rumor-remind-me-when... 2. http://www.androidpolice.com/2014/06/06/exclusive-google-will-soon-introduce-nearby-to-let-other-people-places-and-things-know-when-youre-around/ http://www.androidpolice.com/2014/06/06/exclusive-google-wil...