Yes, this is new and I am not sure exactly how it works. I am thinking that it's just for character meals or two dining credits, right? Do I need to secure all dining with my credit card? Fine with me, anything to make it easier to book them! I know about the 24 hour notice thing too. Hopefully by doing all of this Disney has kept people from double booking.
http://www.themouseforless.com/tripplanning/dining/ADR2.shtml#CC
Restaurants requiring a credit card guarantee will not charge the card except for no-shows or when cancellation penalty applies. At these restaurants, you may pay for your meal after dining by cash, room charge, credit card or Dining Plan credits. Restaurants requiring pre-payment in full will refund payment only if reservations are canceled 48-hours in advance.
Restaurants Requiring a Credit Card Guarantee
Victoria & Albert's (including Chef's Table) - Grand Floridian Resort and Spa - $25 per person penalty; cancel 48 hours in advance for Chef's Table
Citrico's Chef's Domain (6-course meal in a private dining room ) - Grand Floridian Resort and Spa (407-939-7707 for reservations) - $100 penalty; cancel 48 hours in advance
Fantasmic! Dinner Package - Select Disney's Hollywood Studios Restaurants - cancel 48 hours in advance
Wonderland Tea Party - Grand Floridian Resort and Spa - cancel 48 hours in advance
Candlelight Processional Dining Package - Select Epcot Restaurants during Holiday Season - cancel 48 hours in advance
Princess Storybook Dining - Restaurant Akershus - Norway Character Meal at Epcot
1900 Park Fare - Grand Floridian Resort and Spa Character Meal
Artist Point - Wilderness Lodge Resort Signature Dining
California Grill - Contemporary Resort Signature Dining
Cape May Café - Beach Club Resort Character Meal (breakfast) and Buffet (dinner)
Chef Mickey's - Contemporary Resort Character Meal
Citricos - Grand Floridian Resort and Spa Signature Dining
The Crystal Palace - Magic Kingdom Character Meal
Flying Fish Café - Boardwalk Inn Signature Dining
The Garden Grill - Epcot Character Meal
Hollywood & Vine - Disney's Hollywood Studios Character Meal (breakfast & lunch)
Jiko - The Cooking Place - Animal Kingdom Lodge Resort Signature Dining
Le Cellier Steakhouse Epcot - Signature Dining (lunch and dinner)
Narcoossee's - Grand Floridian Resort and Spa - Signature Dining
'Ohana - Polynesian Resort Character Meal (breakfast) and dinner
Tusker House Restaurant - Animal Kingdom Character Meal (breakfast & lunch)
The Hollywood Brown Derby - Disney's Hollywood Studios Signature Dining
Yachtsman Steakhouse - Yacht Club Resort Signature Dining
Restaurants Requiring Pre-Payment in Full*
Those on Disney's Dining Plan should mention at the time of reserving reservations for these restaurants intentions to use table credits to pay for the meal when calling by phone. Your credit card shouldn't be charged when reserving, but you'll still have to give Disney the credit card number and cancellation dates and policies will apply.
Cinderella's Royal Table - Magic Kingdom
Hoop-Dee-Do Musical Revue Dinner Show - Disney's Fort Wildness Resort and Campground
Mickey's Backyard BBQ - Disney's Fort Wildness Resort and Campground
Polynesian Spirt of Aloha Dinner Show - Disney's Polynesian Resort
Disney Girl's Perfectly Princess Tea Party - Grand Floridian Resort & Spa
Magic Kingdom Fireworks Dessert Party - Magic Kingdom
*Restaurants requiring a pre-payment will refund the payment in full as long as reservations are canceled at less a day in advance; otherwise, full payment is forfeited.