Like last year for OpenGL 4.3, the Khronos group took the advantage of the current SIGGRAPH 2013 to announce the the specifications of OpenGL 4.4.
The official OpenGL 4.4 specification includes the following new extensions:
In the OpenGL registry we can also found these new extensions released at the same time than OpenGL 4.4 specifications:
At the GLSL level, OpenGL 4.4 comes with a new version for shaders:
#version 440 core
#version 440 compatibility
All OpenGL 4.4 related specifications and extensions are available HERE. The complete press-release for OpenGL 4.4 can be found HERE.