Planned release time: 10am PST, alternatively just check the countdown timer on the steam sales page. Maybe give this thread a bump...
Release Time? (thread) As to the OP...
Day/night cycles were cut long ago, you may want to check this thread...
Is day/night cyle possible in a future update? (thread)Apart from that, some of the phantom forest didn't make it, but that area is apparently pretty fuckhuge anyway so no one seems to care.
More significantly, the AI personalities haven't been finished yet but have been promised soon in a patch, so depending on if you wanted to play with this feature, you may choose to wait a little while or not. Additionally, 2 of the 4 planned companions will come later in a patch, 2 will be in at release. This thread is long but discusses the AI personalities and companions if you are interested.
Can we eventually get a list of late features? (thread) As for bugs, it is difficult to say as the game will be updated upon release. All games have bugs and one like this with such high reactivity and interactivity will be prone to them. Yet Larian have stated that this is the most polished game they have ever released, and more significantly, that they have fixed all 'major' bugs. Ie, if you encounter any they are likely to be minor and not gamebreaking. However, as they have been adding features right up to (and beyond) release, it may be a concern. We shall see. My personal opinion is that it will be more than playable, with nothing you can't reasonably overlook, though it will benefit from a few more patches in the future. This is just speculation however. If you are concerned you may want to wait awhile to see what people say when they play it.
Is the game ready to be enjoyed? Yes.