The good news is that it does install & work (after removing nouveau) & glxgears is now comparable to my 11.10 install (see my comment #88 for comarison) & pretty much rips:

$ glxgears -info
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER   = Quadro4 900 XGL/AGP/SSE2
GL_VERSION    = 1.5.8 NVIDIA 96.43.23
GL_VENDOR     = NVIDIA Corporation
GL_EXTENSIONS = GL_ARB_depth_texture GL_ARB_imaging GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shadow GL_ARB_shader_objects GL_ARB_shading_language_100 GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_texture_rectangle GL_ARB_transpose_matrix GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_Cg_shader GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_gpu_program_parameters GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_paletted_texture GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_shared_texture_palette GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_object GL_EXT_timer_query GL_EXT_vertex_array GL_HP_occlusion_test GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square GL_NV_copy_depth_to_color GL_NV_depth_clamp GL_NV_fence GL_NV_fog_distance GL_NV_light_max_exponent GL_NV_multisample_filter_hint GL_NV_occlusion_query GL_NV_packed_depth_stencil GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_register_combiners GL_NV_register_combiners2 GL_NV_texgen_reflection GL_NV_texture_compression_vtc GL_NV_texture_env_combine4 GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2 GL_NV_texture_shader3 GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_program GL_NV_vertex_program1_1 GL_SGIS_generate_mipmap GL_SGIS_multitexture GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow GL_SUN_slice_accum 
8368 frames in 5.0 seconds = 1673.413 FPS
11717 frames in 5.0 seconds = 2343.388 FPS
10713 frames in 5.0 seconds = 2142.474 FPS
11459 frames in 5.0 seconds = 2291.688 FPS
11388 frames in 5.0 seconds = 2277.531 FPS
10105 frames in 5.0 seconds = 2020.909 FPS

The not so good news is that you still can't get 3D with Unity:
$ /usr/lib/nux/unity_support_test -p
OpenGL vendor string:   NVIDIA Corporation
OpenGL renderer string: Quadro4 900 XGL/AGP/SSE2
OpenGL version string:  1.5.8 NVIDIA 96.43.23

Not software rendered:    yes
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      no
GL vertex buffer object:  yes
GL framebuffer object:    no
GL version is 1.4+:       yes

Unity 3D supported:       no

But that's not really a problem for me as I run gnome-shell instead of Unity & it's just nice to get actual video performance back! Thanks Aaron Plattner (nvidia). Now if we can get jockey updated to include 96.43.23 I'll be happy(ier).