I recently emailed Stainless Games with the following question a few days ago:

Can someone please look into adding the Official Graphics Pack for Carmageddon II on GOG.com?

http://wiki.carmageddon.com/wiki/Official_Graphics_Pack

Thanks,

EnforcerSunWoo

Today I got the following response:

Hi EnforcerSunWoo,

Many thanks for sending through your suggestion. I will pass it onto the rest of the team.

Thanks, J

The Official Graphics Pack might not be fully confirmed for release, but at the very least they are going to be looking into it.

Nice to know. I'll keep this in mind the next time I get an itch to dive into Carmageddon.

Well done. That's why the call you the Enforcer.

Why should it be implemented into the GOG release?
It's just patches to swap from a gore mode to another, all these patches are available online.
Using any of these patches on the GOG release would be a rollback (aside from turning it into Zombie or Alien mode). So it could be a bit annoying for them to support it. IMO it's better to leave it up to the player to download and install these by himself.

Moreover, the GOG release ships with larger textures than the original release and these patches:
http://www.toshiba-3.com/temp/comparison.png
So they would overwrite that :o

Seems nothing happened.