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Here are the true leaks:
-the new group are the Prism Cult. They are a secret group of fallers living in the ultra-dimension thanks to really developed technology.
They are UB enthusiasts but you later learn that they are controlled by "Necrozma" (it's more complicated than this i'll explain later) who wants to be free and regain its original form: A being of pure light named Prizoma (UB-Ray) It was trapped by evil ancient humans who wanted to harness its powers.
However, Necrozma is composed of 2 pokemons. What you call Nekrozma is just the black prism UB and its ability is to capture light.
The "pure light being" is Prizoma. Prizoma can travel through realities and it'll have relevance to the plot.
The game doesn't offer a ton of new content dex wise. There is only 5 other new UBs named UB-Ray (Prizoma), UB-Nest and UB-Hole.
You know the other two.