You do never know, but for some reason they did spoil Neal/Mulan is not an intentional thing when it came up at ComicCon and in some twitter follow-up. I’m not sure if there’s a plot reason for them to split up this way, or was it just the blurb’s wording that implied it by leaving out Phillip and Aurora. If it is plot-driven, then my guess is that they have to journey somewhere dangerous, and Aurora and Phillip will stay behind so she can try to reach Henry/Snow/Charming in a dream (after suitable bravery from Aurora about the burn risk and concern from Phillip and Mulan).
Aurora will then reach Henry because he’s most likely to suffer nightmares given his situation, and he’ll find out Neal is alive (yay) but AUrora won’t be able to tell him that Henry is in NL (boo) and he’s going the wrong way. Drama, tension! Can they catch up and send a message somehow to Neal/Mulan?
At least that is what I’m thinking now. I’m sure Phil and AUrora deserve taco time too though, in their case, maybe he’s helping his beauty “sleep”.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass