id Tech 5 or 6 may be a Ray Tracing-based engine, according to John Carmack (inventor of all that is good). We shall have to see. A lot of debate recently has gone on about the future of graphics. Will consoles disappear? Originally they were invented because PCs didn't have the power or utility. Where will graphics chips end up? Some want to merge the CPU and GPU, while others want to separate them even more and include the physics simulation on the GPU, and some, like John Carmack, think the GPU needs to start doing ray tracing.