UPDATE 2: The doll release has been changed again. They will be sold in stores Monday May 30th, and will be sold online Tuesday the 31st.
Mandarin Outfit Alice and Iracebeth the Red Queen will be individual dolls which will be a Limited Edition of 4,000 and sell for $129 each. This is a price increase from the last release at $119. The Platinum Collection also returns with a duo set of Adventure Hero Mad Hatter and Ribbon Fantasy Alice. The set will sell for $750, but the edition size has been changed to 450 (the Aladdin and Jasmine Set was LE 250 and Wedding Cinderella was LE 500). Each of the dolls will go on sale online and in stores on May 27th (the dolls most likely first showing up online at midnight Pacific Time). These dolls will also be available in the UK on June 16th in stores and online.
There isn't any official word on what dolls will be released in the future. There is rumor of a doll from the upcoming Moana movie and another Princess doll to be released in the fall.