There are some people out there reading the book as a whole and a couple of them have asked me if they should stop reading it. Nah. The overall arc of the story is going to remain in tact. So you really aren't going to miss much. But many things will be different.
I will be altering a couple of characters as well as a relationship. I'm also going to combine two characters into one since they're already so similar and serve a similar purpose. I'm eliminating another character and subplot altogether because they don't really do anything to advance the story. An antagonist is going to be introduced earlier and I think he's going to be much scarier. Finally, a very minor character is going to come back and play a major role in the second book after giving us a cliff-hanger and the end of book one.
I know that's all very vague, but I don't want to give away the farm. I know it's really vague for anyone who hasn't read the book yet at all. You will. It's gonna be huge.