According to the American Girl Facebook page, there will be an American Girl doll sale following their appearance on Jill's Deals and Steals from the Today Show at 9am. I assume these will be available starting at the Eastern time, so 6am West Coast time.
Rumor is that you will have to watch the Today Show segment to get a code that you will need to enter when placing your order to get the discount.
I would say it is safe to assume that stock online will last for literally SECONDS. So get ready!
This is what the item pages say right now (note: they all say "out of stock" and we assume when the show airs, they'll be available): "Today Show Steal & Deal offer: Save 61%, today only. Discount will appear in checkout."
Here are some item links for ya:
Marie-Grace Doll, Book & Accessories
Cécile Doll, Book & Accessories
Half-Canopy Bed Special Offer
As far as we know, these are the only 3 items which will be discounted.
You're more likely to find a $20 bill on sale than these! So be ready for the insanity once this show airs!
(Thanks, Wheel N Deal Mama!)