OneNote on Windows will get a series of updates over the next 12 months. The updates include a visual refresh, the latest Microsoft pen and ink advancements, a new navigational UI layout option that can flex for customer preferences, and more! The objective of the changes is to unify the OneNote app installed with Office and the OneNote for Windows 10 app available in the Microsoft Store. The end result will be a single OneNote app on Windows with the ability to use the interface and features you're familiar with.
See
What's Coming to OneNote for additional information.