In 2013 the Horizon.K12 Advisory Board voted for the top 12 emerging technologies as well as the top ten trends and challenges that they believe will have a significant impact on teaching, learning, and creative inquiry in global K-12 education over the next five years. Augmented Reality was identified at that time as Long-term horizon: four to five years technology
This video presents Charles Cooper and Jill using it through the app Aurasma with their students. This link presents a number of applications http://www.educatorstechnology.com/2014/07/video-tutorials-for-teachers-on-using.html