The OpenGL 2.1 and OpenGL Shading Language 1.2 specifications have been released.  OpenGL 2.1 adds backwards compatible enhancements to OpenGL’s advanced programmable pipeline including: Pixel Buffer Objects for fast texture and pixel copies between frame buffer and buffer objects in GPU memory; texture images specified in standard sRGB color space for enhanced application color management flexibility; and numerous additions to increase the flexibility of shader programming including non-square matrix support, support for arrays as first-class objects, a fragment position query in shaders using Point Sprites and an invariant attribute for variables to enhance shader code reliability.  Read Khronos/ARB press release.

The OpenGL ARB is also developing an OpenGL 2.1 SDK complete with reference documentation, sample code, tutorials, tools and utilities for release in 2006.

OpenGL 2.1 Specification (pdf dated 2006/07/31)