Pre-order book 3!

Amazon is now letting you pre-order the 3 book.  For $13.59, on Amazon they added a teaser that  is refreshing the end of Insurgent. This is the teaser

What if your whole world was a lie?
What if a single revelation—like a single choice—changed everything?
What if love and loyalty made you do things you never expected?
The explosive conclusion to Veronica Roth’s #1 New York Times bestselling Divergent trilogy reveals the secrets of the dystopian world that has captivated millions of readers in Divergent and Insurgent.

Amazon says the book is 384 pages long but Harper-Collins says so far it is 544 pages. That is not the final number and their might be less or more.