The My Little Pony Friendship is Magic Rainbow Power toys are connected to the box on the Root of the Tree of Harmony show.
Most likely
No, that box transformed into castle
no. and that rainbow kingdom is Cloudsdale.
That is unlikely. There have been hints of something called Rainbow Power, hwoever, which could be connected with the contents of the box.
The Crystal Empire is the Rainbow Kingdom in your Little Pony Friendship is Magic.
Yes, the Twilight's kingdom from My Little Pony Friendship is Magic is the Rainbow Kingdom.
Probably not. It has been said by the production team of Equestria Girls that Equestria Girls was meant to be a standalone, and not be connected to the TV show My Little Pony: Friendship is Magic.
It is not known what these flashes of rainbow in the pony's eyes is supposed to represent, but this will likely be revealed in the Season Finale of Season 4 of My Little Pony: Friendship is Magic.
This information has never been revealed, so I can only guess. I would suggested watching the Season 4 Finale when it is released to find out. In my opinion, the Rainbow Kingdom and the Tree of Harmony box are related.
Yes, the My Little Pony Friendship is magic episode Twilight's kingdom is involved in the rainbow power.
Rainbow Dash is one of the main characters in My Little Pony: Friendship is Magic.
Yes. In the season finale, the box under the Tree of Harmony opened and the ponies transformed into their Rainbow Power equivalents. They looked exactly like the toyline this design spawned from.