From the 3.2 API Change Forum the following was listed by someone that grabbed the details. Not sure how accurate or complete it is.
MultiCastActionBarFrame.lua
self:RegisterEvent("UPDATE_MULTI_CAST_ACTIONBAR");
New event
ShowMultiCastActionBar();
LockMultiCastActionBar();
...
UnlockMultiCastActionBar();
HideMultiCastActionBar();
...
ChangeMultiCastActionPage(self.page);
...
SetMultiCastSpell(ActionButton_CalculateAction(parent.parent.actionButton), self.spellId);
...
local slot = _ComputeMultiCastSlot(parent:GetID());
New API (widget?)
knownMultiCastSummonSpells[index] = (IsSpellKnown(spellId) and spellId) or nil;
New API: IsSpellKnown(spellId)
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