It doesn't look like she loses here magic. She gains extra magic from the other princesses. Although we cannot say for certain, that magic will likely be returned to its rightful owners. It would not make much sense for her to keep it while the rulers of Equestria were left without magic.
Yes, the My Little Pony Friendship is magic episode Twilight's kingdom is involved in the rainbow power.
Most likely, she will.
By episode: Rarity: S4 E8 "Rarity Takes Manehatten" Rainbow Dash: S4 E10 "Rainbow Falls" Pinkie Pie: S4 E12 "Pinkie Pride" Fluttershy: S4 E16 "It Ain't Easy Being Breezies" Applejack: S4 E 20 "Leap of Faith" Twilight Sparkle: S3 E26 "Twilight's Kingdom Part 2"
I don't have the exact episode number, but Dark Sage makes his appearance in the Duelist Kingdom arc, in the Finals duel between Yugi and Joey. Joey uses his Time Wizard to age Yugi's Dark Magician, and it gets turned into the Dark Sage.
Its either Tower of Terror or Expedition Everest.
Yes, Cadance will appear in the My Little Pony Friendship is magic episode Twilight's kingdom.
Yes, the shining armor will appear in the My Little Pony Friendship is Magic episode twilight's kingdom.
It has not been revealed who the villain in Twilight's Kingdom will be.
Yes. The Villain in Twilight's Kingdom has been revealed to be named Tirek.
Yes, the My Little Pony Friendship is magic episode Twilight's kingdom is involved in the rainbow power.
In all likelihood, yes. It has been mentioned that Twilight will focus her efforts on unlocking the mystery of the box, and no new episode leading up to the finale will center on Twilight.
Yes, the Twilight's kingdom from My Little Pony Friendship is Magic is the Rainbow Kingdom.
No information has been revealed as to who the villain will be.
No information has been revealed as to who the villain will be.
It is not announced when promos will start. Such things are usually not announced.
Most likely. Since this is a children's show, a happy ending is to be expected.
That is highly unlikely. That would be too dark for My Little Pony. Remember that the show is targeted at young children.