In an effort to provide some information, here is an overview of the new kids menu. To summarize, it appears many, if not all, Table Service restaurants (except restaurants with buffets or that serve family style, and possibly some Signature dining restaurants) will now start serving three set items on all kids menus at restaurants owned by Disney:
Pita Pizza - with diced chicken and mozzarella cheese, served with shredded vegetable salad and brown-sugar apples $7.49
Just Dip It - assorted fruits, vegetables, chicken salad and yogurt $7.49
Chicken Strips - served with barbecue sauce, sweet potato sticks, green beans, carrots and yogurt parfait $7.49
In addition to this, there will be at least two other "Kids Pick" (or a la carte) items that include choice of appetizer (generally a salad or soup), entree, and dessert (generally a fruit salad or ice cream). These choices, especially the entrees, vary by restaurant.
Although some initial reports suggested these new menus were being fairly strictly enforced, more recent reports show that some restaurants also have other options for kids not listed on the new children's menus, so you can ask servers for other options. You also can ask for substitutions for specific items in the set meals. Implementation seems to be spotty - sometimes the wait staff is happy to assist in making substitutions, in other cases a strict "no substitutions" policy has been enforced.
The following is a list of confirmed sightings of the new kids' menu, with a la carte choices in parentheses. Again, there may be additional options besides those listed, so ask your server!
(Note: feel free to post additions and I will try to incorporate them into this list)
Magic Kingdom:
Liberty Tree Tavern lunch (Mac & Cheese; Kid's Feast - turkey/mashed potato/green beans)
Tony's Town Square (Mac & Cheese; spaghetti and meatball)
MGM:
Sci Fi (Mac & Cheese; Hamburger)
50's Prime Time Cafe
Mama Melrose's
Brown Derby
EPCOT:
Coral Reef -- seems to have a broader kids' menu, with choices including gilled mahi-mahi, grilled chicken, pasta and cheese pizza
Le Cellier -- also seems to have a broader kids' menu, with choices including
a 6 oz Steak, cheeseburger, chicken nuggets, grilled chicken, hotdog, and pasta.
Resorts:
Boatwright's - Port Orleans (Mac & Cheese; Hamburger)
Spoodles - Boardwalk
Grand Floridian Cafe - Grand Floridian (Mac & Cheese; Hamburger)
Kona Cafe - Polynesian (Mac & Cheese; Hamburger)
Concourse Steakhouse - Contemporary (Mac & Cheese; Hamburger)
Downtown Disney:
Cap'n Jack's
Finally, there are reports that the new kids' menu is not being implemented at restaurants not owned by Disney. These non-Disney restaurants are keeping their existing menu. This includes:
EPCOT: Chefs de France, Alfredos, Teppanyaki, Marrakesh, Nine Dragons, and San Angel Inn.
Maya Grill
Rainforest Cafe
Planet Hollywood
Big River Grill
ESPN