Divergent Book 3 Announcement On Monday!

The official Divergent Facebook page recently announced that they have a BIG announcement coming on Monday! They said:

Divergent fans – you are the best. We’re so obsessed with you, we want you to be the first to hear some official big news about Divergent #3. Come back here on Monday to find out what it is. ☺

So, what do you think this big announcement is? Is it the title, cover, synopsis, or maybe even all three?