I expect a last minute crisis at this stage to be completely unrelated to the game code. The game has "gone gold" as of several weeks ago. I'd put my money on some infrastructural issue with getting the downloads ready for Steam/GOG, or updates to marketing images, etc.
Yep, that's my bet as well, althought late review codes is weird, but that could again simply be related to something other than code. I certainly hope it's not code, as last minute code changes are almost always a bad idea. I'm not worried in the slightest. Larian are professionals.