The Khronos Group has released the OpenGL 4.3 at Siggraph 2013.
OpenGL 4.4 turns out to be a small update of OpenGL 4.3 but it comes with a good number of ARB extensions which gives us a glance at OpenGL 5 hardware level.
So OpenGL 4.4 is made of 8 extensions but really GL_ARB_texture_mirror_clamp_to_edge is simply one new wrap mode, GL_ARB_texture_stencil8 is really just one new texture format and GL_ARB_vertex_type_10f_11f_11f_rev just a single vertex attribute format; none of these being a "selling" feature, but addition for the purpose of completeness which is already nice.
On the ARB extension side, we have 7 new extensions all of them except GL_ARB_shader_group_vote and maybe GL_ARB_compute_variable_group_size requiring post OpenGL 4 hardware.
Sadly still no Direct State Access progress. Happy 5 years complain anniversary!
Not real surprise but NVIDIA has released beta OpenGL 4.4 drivers exposing also all the new extensions. More surprisingly, NVIDIA has released three new proprietary extensions: NV_blend_equation_advanced, NV_bindless_multi_draw_indirect, NV_gpu_program5_mem_extended,
Unfortunately, I haven't finished writing my OpenGL 4.4 review but as it is customary it will be published as soon as possible.