slew of new features for teachers and students who use Office 365 Education. Among those new features is an option that anyone using OneNote Class Notebooks is sure to appreciate. That is the new option to lock pages as "read only" for students.
A couple of other new OneNote features to note (see what I did there?) are the integration of Desmos and new digital stickers to use when giving feedback on a OneNote page. Desmos is a free graphing calculator. I've covered Desmos extensively in the past. In addition to the calculator itself, Desmos has a large collection of free math lesson plans.