Good grief! Deep breaths... Relax.
This always happens. Always. There is usually some last minute hijinx necessary to the release. This happens with every developer, but we all know that TWI will release a great product when its ready. Furthermore, they will back this product to the bitter end of its life-cycle, unlike many other developers.
Is it frustrating waiting extra hours for a game you've waited months for? You betcha! It will be released soon, and I'm sure the vast majority of us will be pleased with it. Almost immediately, though, we will be clamoring for more updates, fixes, and environments in which to play, and those will be released faster than you would believe. Getting fixes frontloaded makes for better play, a better initial customer reaction, and fewer needs for fixes down the line. It's better to wait now than have to deal with big issues in the game just to meet a deadline.
On the other hand, while the TWI folks are running around with their hair on fire, it must be nice to know that we are out here clamoring to partake in their work.