When running the new AmigaOS (called Amiverse) on top of another operating system such as Windows xx/NT, Linux, Mac, Classic Amiga etc it will use the native operating systems OpenGL drivers.
Amiga designed desktops which run natively on the hardware will come with Matrox graphics chips. However there will be drivers developed for other manufacturers custom chips (3DfX, ATI etc) for use in Amiga systems designed by other manufacturers. Nvidia will not share their source but when Amiga have consumer products released maybe they will develope their own.
Another point is that the AmigaOS will be available for Dreamcast and other next generation consoles, weather that’s hosted or non-hosted I don’t no.
PS The OS is object orientated and the first version of the Amiga SDK out now (www.amazon.com) does come with a C/C++ compiler, virtual processor assembler and java environment (OpenGL support soon).
Thank for reading Mike.