ZE3 speculation

This is my first 'blog' I don't know how blogs work on wikia, so please don't hurt me ;_;

So as I don't know much about it, I was wondering if some people could shed some light on what ZE3 uncovers.

I'm aware the following characters are going to be in it:

  • Junpei
  • June
  • Sigma
  • Phi
  • Diana

I was wondering what is the basis of what's meant to happen?

I'm completely confused, I'm not sure what they're attempting to do with the Story in ZE3.

Are they trying to give coverage for the un-answered questions? I don't really understand and some simple explanation would be appreciated.