I got the following hint when I registered my version online:

**** SPOILER ****

"When you think you're ready for the challenge take on a compound. The Tattaglias in north east Brooklyn might be the weakest family in New York, but that doesn't mean they are going to let you walk right in. Bring some bombs along and blow up the support pillars in the basements. You may start a mob war, but if you are successful you'll have a new safe house with a bunch of guards."

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Also, after filling out the survey, I got the PC cheats that Rich posted, with one change:

Go to the Load Game menu and, using the keyboard, type: UNLOCK MOVIES -- tattaglia

Go to the Pause Menu (by pressing ESC) and, using the keyboard, type:
FULL HEALTH -- corleone
FULL AMMO -- stracci
$5000 -- cuneo