There was over 85,000 lines of code removed when stripping out the old drivers last week from the Mesa mainline tree. There's about one dozen new patches surfacing today that also shed more weight from core Mesa. These patches today aren't removing any functionality from the drivers still within the Mesa tree, but rather is eliminating code that can be done away with now that the old drivers have been dropped.
The principal work done by today's patches is removing the front-facing bits of the GL_EXT_paletted_texture and GL_EXT_shared_texture_palette extensions to OpenGL. Old drivers such as the 3Dfx Mesa driver still exposed this extension and benefited from the OpenGL paletted texture support. GL_COLOR_INDEX data still can be uploaded, but the data can no longer be stored internally as a color index.
This first clean-up move since stripping away the old Mesa drivers will lighten up core Mesa by over 1,000 lines of code.
The patch series begins here, but will likely be merged to Mesa Git soon without any resistance.