Google Scholar to see what has been written on the topic of VR in education. The following three papers stood out to me.
Construct3D: a virtual reality application for mathematics and geometry education.
On the usability and likeability of virtual reality games for education: The case of VR-ENGAGE.
Can virtual reality improve anatomy education? A randomised controlled study of a computer‐generated three‐dimensional anatomical ear model.
All three of these studies found that virtual reality was beneficial to students. Each study came to that conclusion in a different context. The first found an improvement in students' comprehension of geometrical concepts. The second found an improvement in students' understanding of geographical concepts and relationships, but only with prior knowledge. And the third study found an improvement in students' understanding of anatomy.
These three studies had small sample sizes and control groups that could probably be categorized as "high achieving, highly engaged" students. Whether or not the outcome of the students linked above will be similar to those of other students is still to be determined. That said, I'm excited to see what happens with virtual reality in K-12 classrooms over the next five years.
Disclosure: Samsung paid for my hotel room during the 2016 ISTE conference.