Let me put it this way
It's as much news as Dusk-Lycanroc and the Necrozma formes
Yes, we know there will be new Pokémon. Admittedly, new species is a new thing, but UBs have broken almost every pattern already.
If they wanted to enlighten us more one new potential Pokémon, they would have at least revealed one new UB and one new Alolan form.
What about more important things like new characters, story, battle mechanics, new minigames, in-depth explanation of new areas, new challenges, gyms or trials.
As we know it now, there are just a couple side areas, an upgrade to an existing feature, four forms, two mons, some clothes, and 2 or 3 new z moves.
That sounds like DLC rather than a new game.