It was delayed a few months ago as the original release date was December 7th which was the day before Halo Infinite so Techland decided to delay the game two months. It went gold last week so im not expecting any more delays or issues. Would love to see Techland move up the release date two weeks so it can have some breathing room considering that February is packed.
Yes, it can be fully played solo which is how I will be playing. Below is an 16 minute walk-through trailer.