A couple pages from the CoroCoro magazine has begun to leak, showcasing a few images from the TCG, anime, and the upcoming games: Pokemon Scarlett and Pokemon Violet.
Please not that the image regarding the anime contains spoilers, so be careful in case you want to go into the Master 8's tournament blind.
While the images for Pokemon Scarlet/Violet don't contain anything substantial, it does give a couple of new insights regarding outfits, battle, and a mysterious dark image, which the contents are still being looked into. Will update this post if additional information comes about.