Dennis Martin, founder and President of Demartek, a computer industry analyst organization with its own ISO 17025 accredited test lab, has published his observations from attending the Flash Memory Summit (where he also was a presenter) and the Intel Developer Forum events this year. NVM Express was prominently mentioned.
In addition, Dennis showed some NVMe performance results in one of his FMS2015 presentations — you can also view the slides and see the specific test results.