I’d be shocked if they didn’t do something like that.
One thing I noticed looking at the known Pokémon: there’s extremely few fire Pokémon that we know of in SwSh.
Charmander (I almost don’t want to count this as if they are adding starters from a gen there’s almost certainly all of them)
Growlithe
Vulpix
Litwick
And that’s it. I’m curious what else will be in. Has to be at least a few other Fire types being in Galar from previous gens. I’d imagine volcano fire type Pokémon to go with the mine area. Turtonator, Torkoal, Numel. Some combination of those. Also, how can they not have Pyroar?
My dream would be Numel just because I just got a shiny one and that shiny black Camerupt is amazing.
If you look back, there's few fire pokemon added in a lot of the generations; especially when you exclude the starters (which are always Water/Grass/Fire):
Gen 2: Slugma/Magcargo, Hondour/Houndoom, Magby, then 2 Fire legends in Entei & Ho-Oh
Gen 3: Numel/Camperupt, Torkoal, Sunny form for Castform, and technically Groudon due to Primal Reversion giving it Fire type in Alpha/Omega
Gen 4: Magmortor, Rotom's Oven form, then 1 Legend in Heatran
Gen 5: Pansear/Simisear, Darumaka/Darmanitan, Litwick/Lampent/Chandelure, Heatmor, Larvesta/Volcarona, then 1 Legend in Reshiram
Gen 6: Fletchinder/Talonflame, Litleo/Pyroar, and 1 DLC Legend in Volcanion (that released so far after Black/White that its mostly forgotten)
Gen 7: Alolan variant Marowak, Oricorio's Flamenco dancer form, Salandit/Salazzle, Turtonator, and 1 Ultra-Beast only available in Ultra games: Blacephelon
So when you don't count the starters, there's
very few Fire pokemon added each generation. Gen 5 was the first to really add a large amount and the only Gen so far to introduce a Pokemon where all 3 forms were Fire other than a starter pokemon. In essence, I'm saying it's not very surprising we haven't seen any Fire type pokemon yet as they always seem to be rare lol.