And look at its Pokédex form:
There is a video about Rotom, along with new lands to explore and two new legendary Pokémons: Solgaleo and Lunaala. The new land is Alola, resembling with Hawaii in real world; and it includes new friends: Hau and Lillie. Here is the video:
Pokémon: Sun and Moon will be out in Christmas for 3DS.