Khronos has just announced the release of the OpenGL 3.3 and OpenGL 4.0 specifications. New features include:
- Improved interoperability with OpenCL
- Tessellation shaders
- More flexible fragment shaders
- Shader subroutines
- 64bit precision data types
- sampler objects (finally!)
OpenGL 4.0 presumably requires DX11-level hardware, while OpenGL 3.3 will remain compatible with DX10-level GPUs.
OpenGL 3.3 and 4.0 support will land in OpenTK 1.1.
Official announcement: opengl.org.