New Synopsis for Clockwork Princess

You are probably very familiar with this synopsis of Clockwork Princess:

Danger intensifies for the Shadowhunters as the New York Times bestselling Infernal Devices trilogy comes to a close.

If the only way to save the world was to destroy what you loved most, would you do it?

The clock is ticking. Everyone must choose.

Passion. Power. Secrets. Enchantment.

Danger closes in around the Shadowhunters in the final installment of the bestselling Infernal Devices trilogy.
  
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And now, the UK version of Clockwork Princess has a new synopsis that might gives us more about what will probably happen in CP2:

Tessa Gray should be happy – aren’t all brides happy? Yet as she prepares for her wedding, a net of shadows begin to tighten around the Shadowhunters of the London Institute. A new demon appears, one liked by blood and secrecy to Mortmain, the man who plans to use his army of pitiless automatons, the Infernal Devices, to destroy the Shadowhunters. Mortmain needs only one last item to complete his plan. He needs Tessa. And Jem and Will, the boys who lay equal claim to Tessa’s heart, will do anything to save her.

TMI source says that it's intense. It's not JUST intense. Will and Jem will do anything to save her. And that's the very core of the problem, because that can mean so many things, and on top of them is DEATH. And what "new demon" here? Damn it, are you trying to torture me with the "innocent" synopsis?