I've covered Mystery Babylon somewhat in this thread so won't reprat what I've already posted, but I would like to add this:

The woman on the beast maybe rules the 7th kingdom, which also encompasses all other empires before it. Moreover, she spread her influence throughout the entire world - so we can have this global world order.

This would fulfilled the eighth kingdom being also of the 7th - because it is worldwide.

The question is how does this global world order become the new world order - if Mystery Babylon is destroyed by the beast and the 10 kings?

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Besides mystery Babylon and antichrist identities being a secret up to this point - we have the 10 kings who we know very little about.