Consulting firm Igalia has been working on the ARB_internalformat_query2 support for the Intel i965 DRI driver. These 63 patches posted today under a "request for comments" state implement the support for core Mesa and the Intel i965 back-end.
Igalia is interested in getting more developers to review this work while they are still putting the finishing touches on the code. Implementing this extension took nearly 2,000 lines of code for core Mesa and the Intel driver.
Details on the patches for this GL 4.3 extension can be found via the Mesa-dev list.
The ARB_internalformat_query2 extension is documented via the OpenGL.org registry. Work on this extension was done in part by TransGaming, the company formerly working on Cedega that now is just focused on Smart TV gaming.