1)
I’m picking they chose that ‘style’ for the promo is many of that particular bands (Of Monsters & Men) music vids are done in that particular style I guess- I got hooked watching those after seeing this promo vid & tracking down the song lol 😉
In fact some of the vids are so intriguing I was only watching the vids because the songs made sense when played over the vids- like a mini movie or sorts, but almost none at all when listening to them without the vids 😕 Esp liked the one with the glowing fractal hare/rabbit & tuna/marlin thingys- called Kings & Lionheart.
2)
Rumple would be after Henry because Henry is the “undoing” of him/darkone.
3)
I got more of a feeling that the dragon thing (which at 1st I thought looked more like the Yaoguai, but has to be ‘the dragon’ as that makes way more sense), which having come out of the ‘magic smoke’ is Tamara, was taking down Rumple, Regina & then Hook while after Emma & Henry….Of course that would imply that those 3 bite the dust & I cant see that happening, so I think they were chosen for being the most popular villains 😉