The perpetually licensed version of the desktop Office apps, branded Office 2019, was released today.
A consumer release will come in the next few weeks.
Office 2019 is supported on Windows 10—exclusively; no Windows 7 or Windows 8.1 support is available—and the three most-recent versions of macOS (that is, today's release of 10.14, 10.13, and 10.12).
There's no 2019 version of OneNote at all; the Windows 10 UWP version of the app is now the primary version, though Office 2019 customers will still be able to install OneNote 2016 if they prefer.
The four core apps have new features, but those features aren't as new as they seem; they've been available to Office 365 subscribers already.
Office 2019 represents a fixed snapshot of the Office 365 release; over 2019's supported lifecycle, it will receive security and stability fixes, but it won't pick up any further new features.