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I don't think I'll feel excited for BDSP until they reveal something that's not in the original. Back when A Link Between Worlds was announced, I though, "meh, I'm not that big on A Link to the Past"... until the trailer that revealed Hilda.
I remember when I was little, before I knew anything about Black and White, I thought they'd keep pushing back Arceus' National PokeDex number because it was too important to not be the last. Also, the national ordering of Gen 2 Pokémon is a mess.