Another
thread dealing with the messages.
It is obvious that the latest message use more advanced encryption than the previous ones*, they must finally have found a homin to help them with that task.
Cracking the code would be interesting, but the effort doesn't seem to be worth it to me.
Consider the previous messages and their content, I would venture that the latest one is about the same.
* For instance note the similarities with message 4 and the unsolved one
here (scroll down to around last half of the page).
Just an example of what more complex encryption can look like, even if it just say "hello world", another example is PGP/GPG.