I think GameFreak will take into consideration what the fans want. They did that with Delphox's typing because of the outrage that was the tiring Fire/Fighting typing of three consecutive Fire starters.
Just like the previous starters, the next batch of starters will probably have a real-life inspiration behind their conception. This time I see them drawing influence from Hawaiian culture-- which I'm totally digging, tbh.
Grass Starters
The Grass starters will be inspired by the flora + hulu dancers of Polynesia. Much like Bellossom, tbh. Its typing will be: Grass >> Grass/Fairy >> Grass/Fairy
Fire Starters
The Fire starters will be inspired by the animals that live in forests that are near the volcanoes. I think they will be inspired by a quadrupedal animal. A bobcat maybe? Or a rabbit? Its typing will be a pure Fire type throughout its evolution line.
Water Starters
They can be anything. But I'm leaning towards something that can live in land as well (for the convenience of Ash's adventure lol). Since Oshawott already happened, I don't see them using sea otter as an inspiration. I think they will be inspired by the swimming feral pigs. Lol. Image:
https://upload.wikimedia.org/wikiped...mming_pigs.jpg
Its typing will be Water >> Water/Fighting >> Water/Fighting
Now while I'm at it, I'll discuss the token Pokemon of the next generation:
The token early Normal-type Pokemon of this generation will be inspired by the Hawaiian mongoose. The body is slender and the head is elongated with a pointed snout. These mongoose mostly eat insects but are opportunistic feeders and will eat crabs, frogs, spiders, scorpions, snakes, small mammals, and birds and bird eggs.
The Bug type of this generation will be inspired by the carnivorous caterpillars of Hawaii that live close by the volcanoes.
The early Flying type (I think the one that was shown in the Nintendo Direct) is inspired by the Hawaiian Red Crested Cardinal!