There are so many definitions for efficiency, so cannot comment on your number of 70%
In any case, there is a strong possibility that the next 1X generation will be conventional floating gate with wrap around IPD and only after that 3D NAND will come.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.