Before I get into the nitty-gritty, know that a big patch with 600 changes - including improvements to graphics and graphical settings - was sent to certification today (Wednesday 20th May), and will take between five and seven days to clear. There will be patch notes covering it all.
In addition, CD Projekt Red will patch the game to allow editing of .ini files on PC, to push graphical settings even higher. You will be able to tweak grass and vegetation density, post-processing effects such as sharpening, and draw distances. The .ini patch will arrive soon after the other patch. "And we think about some other tricks but we need time," Adam Badowski says.