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here are my top theories
1. they will be a race of creatures more like humans than pokemon. they will be capable of training pokemon and act as npc characters.
2. they will be more like mega stones than pokemon. they will attach to pokemon or humans and cause them to become "ultra". ub-01 looks like it could attach onto something and gamefreak has started making more and more different forms of existing pokemon to avoid creating endless new pokemon.
3. they are simply a set of very unique (legendary?) pokemon that are being hyped in a strange way. this seems unlikely but gamefreak has done things like this before.
4. they are mindless creatures you battle as part of the plot, more like pokestar studio monsters than pokemon. this would be rather underwhelming imo.
