I liked it. My first few sips I got a strong taste of the marshmallow but only at first. After that, it was a apple taste with a tangy/sweet of the foam. At first, I was like...this is weird, but good. Then I just kinda settled in and decided I like it. It's a lot though. Even though it's in a normal "Dixie" plastic type cup (I didn't spent the extra $5 for the plastic "souvenir" cup though I saw EVERYONE carrying them around MK today), it's actually quite dense and rich. Love and I split one and it was plenty.
For those curious, I asked a CM at the Tavern about my concerns on the artificial sweetener possibility. On the Disney Parks blog, it was specifically listed as "no sugar added" which usually means artificially sweetened. (Though I will note on the menu board it said NOTHING about "no sugar added" at all. Other quick service locations that have "no sugar added" desserts so specifically label them that way so maybe they've changed the designation of this drink...?) The CM was nice enough to bring me all the packaging for all three components - apple juice mix, marshmallow syrup and passion fruit/mango foam (which comes in a whipped cream type can!) - so I could scan the ingredients. I did NOT see any artificial sweeteners listed. Some preservatives and the marshmallow and the foam both had cane sugar but no artificial sweeteners! (No HFCS either that I saw!) The CM told me they don't have their official "ingredients" book made up yet which is why he brought out the actual components but he said they'd have that soon. He was VERY helpful and gracious about it so for anyone concerned about the new menu items, just ask!