The AOO 4.0 release is a major release with focus on enhancement, improvements, and features with no or even bigger UI changes + bug fixes.
Detailed Release Planning
A more detailed release planning can be found under AOO 4.0 Release Planning|OOOUSERS:AOO 4.0 Release Planning
Release Notes
The related release notes can be found under [OO 4.0 Release Notes|OOOUSERS:AOO 4.0 Release Notes
Test and QA Plan
TBD
Developer Snapshots
TBD