Pokémon always has at least one new Pokémon design shown off every year. Last generation, when they started putting out games annually, they only included one new Mythical in every game, because they'd have shown it off by the next game's release (ie. Marshadow was in the SM code, Zeraora was in the USUM code, Meltan/Melmetal in Let's Go). If there are two newbies in the code, then there's a chance that they're intended to be the 2020 and 2021 reveals, and that they don't intend to bring out a new game next year with new Pokémon in it.
Now, this isn't foolproof- it could be a Mythical and an evo like Meltan, or it could be a Gigantamax- but if there was only one, then we would be near-guaranteed a new game next year, and we're not there at the moment.