Today if you have a Disney Visa (and there are spaces left, most of the limited slots for Chase cardholders are full)
The rest of the inventory opens up on Thursday morning (July 31) at 7 AM Eastern.
There will supposedly be online booking for:
Party for the Senses (general admission only)
3D Dessert (general admission only)
Culinary demonstrations ($15)
Mixology seminars ($15)
Beverage seminars ($15)
Anything else is by phone only.