What’s the murder-to-renovation ratio

Normally it means "We really love you, please love us back with extra money/promotion/etc.?" Same idea as a Limited Edition where you might get extra swag along with the game.

I have Window 7 Signature Edition, which is just Ultimate in a fancy case and I think I got a deck of playing cards and a poster with it or something. Same idea but your disc will be a game :P and Anna's right that you need to give us the game name in order for us to tell you specifics.

Edit: AC:R has the following in the Signature Edition:

The Signature Edition will grab pre-order investors a bonus singleplayer mission, an exclusive multiplayer character, weapons capacity upgrades, an animated short film and an Assassin's Creed: Revelations original game score soundtrack

_{http://www.joystiq.com/2011/06/09/assassins-creed-revelations-signature-edition-with-gamestop-pr/}

I finally beat one of these by simply stacking nothing but riflemen everywhere I could, with fully upgraded barricades with archers behind them to pick off the wusses so I could build up the rear barricades. They never got through my first barricade until the Greek Fire showed up, and the 20+ riflemen I had managed to take him down. (Fortunately, the barricades held long enough - he was almost out of range of most of my riflemen!)

For winning this, my first non-story Den Defense, I was rewarded with the Assassin Caltrop Unit and also this little thing called "Greek Fire Barricade" that I'm willing to bet will come in handy later. :)