>USUM will be mostly low-moderate effort fanservice, including

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>USUM will be mostly low-moderate effort fanservice, including some postgame content and more Kanto references
>"Pokemon Switch" will be like BW2 but for Kanto, order you visit the cities in is switched around, there are some pokemon from other gens in this area
>lots of partner double battles, triple battles also back in the game but not rotation. Lillie is your main traveling partner (1st gym is Vermilion) but there are others who will accompany you at times, mostly fanservice characters like Lillie and N but some more obscure ones too
>more interesting is the gen 4 remakes, which will be switch exclusive
>the most major changes of any remakes in terms of pokemon availability and new functionality
>postgame includes an Arceus subplot like ORAS delta episode
>won't go into details but the final battle is a horde battle with an Origin Forme Giratina that summons UBs
>also Hoopa appears, Distortion World can be visited like a normal area after beating Giratina, after this gen all past event pokes will be made normally available like ORAS did with Deoxys