My son and I saw that video too and he said that he MUST have that when we get there in a couple weeks. I'll try and remember to ask how long it'll be there when we order it.
I read the Disney Blog on it a few weeks ago and it did say only for a limited time though. http://disneyparks.disney.go.com/bl...er-treats-coming-to-disney-parks-and-resorts/
When it debuted I asked one of the CMs about it at Clarabelle's and they said it was only during Spring Break. My guess is that it will last for a bit, probably until the start of the 60th in May.
I agree that it's a big sundae, but pretty good! I liked that the marshmallows are blue through and through and have a slightly minty flavor. The white chocolate decorations (Olaf's face and the yellow flower) are also used on the Olaf cupcake at Jolly Holiday.
So cute! I wonder if they would give me an extra Olaf "head" for an additional fee? I can already see my two young kids fighting over who gets to eat it, but we could never eat two full sundaes!