I got this info from Zynga forum... Niki King, the Super Moderator!
Hope this help you to explain more about the new feature and the switch between GodFather and Marketplace..
Dear Mafia Wars Players,
We’ve given the Godfather page a makeover with the introduction of the Marketplace! Our goal was create a page with a fresh new look; something that’s easy to navigate and that’ll contribute to your game play.
With the new Marketplace, you’ll never miss out on another Limited Edition item on sale. We’ll have easy-to-find hourly sales specials, and you’ll be able to find the coolest loot from the categorized pull-down menus. Get the scoop on what the most coveted items in the game are by checking out the ‘Best Sellers’ and ‘Hot and New’ categories.
There’ll be no more stress for you about how to spend your Reward Points. Now you’ll have items recommended especially for you based on previous purchases and your personal style of game play. Just check out the ‘Recommended for You’ section and you’re all set. If you’re a fighter, you’ll be shown the best attack weapons for the game, and if you’re all about protecting your holdings, we’ll showcase our awesome defense items.
The Marketplace now accepts international payments, and offers over 20 different types of currencies to accommodate our international players. To celebrate the grand opening, we are giving you 2 free Reward Points to use. Simply
We have all this for you, and much, much more. Go play Mafia Wars and get ready to be blown away by the Marketplace!
All The Best,
The Mafia Wars Team
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Source : Zynga Forum!
http://forums.zynga.com/showthread.php?p=4497649#post4497649