In the nintendo treehouse, they revealed 2 new pokemon, the new ratata, Yungoos a mongoose thats always hungry for food.
Then theres Pikipek, the wireframe bird we saw in the sun moon reveal trailer who a woodpecker thats the pidgey of the region.
Edit: A third pokemon got revealed called Grubbin who as the name suggests is a grub, it feeds on electricity and seems to be the caterpie of the region