With the major release of ArcGIS Pro 2.0 featuring many exciting innovations, a corresponding ArcGIS Pro 2.0 SDK was also published. With this SDK, .NET developers can create their own custom tools and workflows for ArcGIS Pro.

Migration
ArcGIS Pro 2.0 is a "breaking change" release. Add-Ins and configurations developed with version 1.4 or earlier must be recompiled. The following points may need to be considered/fixed:
- ArcGIS Pro .NET assemblies are now strong-named
- Some API components have changed, e.g., many formerly asynchronous methods are now synchronous
- ArcGIS Pro WPF styles, brushes, and colors have been renamed
Highlights
- New classes and methods for handling raster, geodatabase, mapping, geometry, content management, and editing
- Visual Studio 2017 support
- Many samples and guides on GitHub
Detailed information about all the new features of the ArcGIS Pro 2.0 SDK can be found in this news blog from Esri Inc. and in the ArcGIS Pro 2.0 API Reference.