So far it seems like it will be a mix of both. Mr Incredible, Ursula, Syndrome and Peter Pan all have special hair pieces that I assume will fit on a normal Minifig head. Mickey and Minnie would have to be moulded heads, I can't imagine them doing just ear pieces and then regular Minifig heads, that would look awful.
I'm wondering if the likes of Genie or especially Captain Hook will have a moulded head, since he has such a unique shape and large nose, or if he'll be a print too.
I was thinking about those faun leg pieces too for Beast, but he actually has pawed feet, not hooves. So they'd have to either make a new, slightly different mould, or just.. print paws over the hooves which... I dunno how good that'd look.