Release Notes: https://github.com/DynamoDS/Dynamo/wiki/Release-Notes#402
Language guide: https://dynamobim.org/wp-content/links/DesignScriptGuide.pdf
Nugets: https://www.nuget.org/packages/DynamoVisualProgramming.Core/4.0.2.3852
You can also download the release version from https://dynamobuilds.com/
Full Changelog: v4.0.1...v4.0.2