The US Army along with Banyan Biomarkers have been working on a simple blood test to administer to patients (in this case soldiers) that can identify even the most minor of concussions.  The USAToday has the full story on this.  This is possibly one of the biggest breakthroughs in concussion research, on the diagnosing side of things.  Traditional imaging techniques, MR/CT, do not show a concussion and are really only used to rule out brain bleeds.  The blood is being tested for certain proteins that are released upon a concussion.  If this trial is conclusive and gets approval this will be another weapon in the arsenal to identify the issue.  Coupled with the research and development in recovery this could mean safer and quicker return to action, whether it be battle or sports.