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The starters will be a Grass/Dark cat (not a sanke, I typed fast and had to put it by mistake, I don't know what I've smoked for it to happen to me haha) named Serpdrake, a Water/Flying Sailor named Golseekr, and a Fire/Ghost Komodo Dragon named Kodrakuon.
There are other new pokemon, about 50, including the classic normal-type rat inspired by the tooth fairy of the Spanish culture, a flying/dark bird inspired by a Bearded vulture. There's also a funny fairy/psychic pokemon that I think looks like a Spanish Holy Week's censer. I have also been able to see what the 'malasadas' of the new region will be, inspired by torrijas, a Spanish sweet. The region is called Betia, I think it comes from the Betis River, now Guadalquivir.
Legendaries are Dragon/Ghost and Dragon/Electric types, I don't know the names, but surprisingly they are inspired by the sun and the moon. The third one represents the Milky Way and is a Dragon/Psychic type, I don't know the name either.
Latest information, there will be six cities. Due to its position, the initial one would correspond to what I think Seville is, then there would be cities that could be associated with Barcelona, Lisbon, Madrid, Zaragoza and Bilbao. There will be medals, but the ways to get them will be different, some challenges will be more like classic gyms, others may be more like Alola methods. Something curious.
I don't know anything else, the new mechanic is obviously inspired by something related to the change of types, but I don't know how it works and neither the name.
All references to what pokemons and cities look like are purely my interpretation.