http://gamestalk.net/post-87062/
-Not a sequel to S/M but the story with "different divergence".
-The appearance of Ultra Recon Squad will change the story.
-Main Story with different development and there's a new post game content after beating Pokemon League.
-People who are expecting minor changes like "Emerald" or "Platinum" should be expecting "Ultra Change".
-There's new game content where players can roam around the Ultra Hole and go to different dimensions.
-Capturing and raising Pokemon became easier compared S/M.
-In some of the dimensions that players go through "Ultra Warp Ride", players will be able to encounter some Legendary Pokemons. One of the Pokemons player can encounter is Mewtwo.
-If one just compares the sheer length of the script, US/UM is twice as long compared to Sun and Moon.
-Not a sequel to S/M but the story with "different divergence".
-The appearance of Ultra Recon Squad will change the story.
-Main Story with different development and there's a new post game content after beating Pokemon League.
-People who are expecting minor changes like "Emerald" or "Platinum" should be expecting "Ultra Change".
-There's new game content where players can roam around the Ultra Hole and go to different dimensions.
-Capturing and raising Pokemon became easier compared S/M.
-In some of the dimensions that players go through "Ultra Warp Ride", players will be able to encounter some Legendary Pokemons. One of the Pokemons player can encounter is Mewtwo.
-If one just compares the sheer length of the script, US/UM is twice as long compared to Sun and Moon.