First, some deets on the new Pokemon:
Name: Crabrawler
Type: Fighting
Crabrawler is a Boxing Pokémon that really hates to lose. It can be found clinging to buildings with its powerful pincers that also pack a powerful punch, or gathering around trees in search of Berries, its favourite food.
Name: Sandygast
Type: Ghost/Ground
Sandygast emerges when the grudges of fallen Pokémon soak into the sand after battle, and its tunnel-like mouth can suck the vitality from people and Pokémon. Sandygast also features a new Water Compaction Ability, never before seen in other Pokémon, where its Defense stat goes up by two if it’s hit with a Water-type move. Sandygast evolves into Palossand.
Name: Palossand
Type: Ghost/Ground
Palossand disguises itself as a sandcastle, with its shovel on top serving, it is believed, as a radar to search out prey. Unsuspecting small Pokémon are dragged into Palossand’s body through its sandy vortex so it can steal their life force.
Name: Stufful
Type: Normal/Fighting
Stufful may have a small body, but this Pokémon has extraordinary strength. Despite its cute, fluffy appearance, Stufful dislikes being touched and will flail its arms in protest. Stufful evolves into Bewear.
You can see the new Pokemon in the trailer below, as well as some more info on them on the official Pokemon website.
Meanwhile, a new feature called 'GX Pokemon' and 'GX Attacks' were announced for the TCG - to be introduced with a new set alongside Sun and Moon. These special GX Pokemon are yet another level of power creep in the TCG format and come with powerful GX attacks that can only be used once per game, and afterwards no other GX attacks can be used by your side, either. Much like EX Pokemon, defeating one will yield two prize cards for the opponent. So far, the only GX Pokemon announced are Solgaleo and Lunala, who have a 'Sol Burst-GX' and 'Lunar Fall-GX' attack respectively. Solgaleo's allows the player to attach up to 5 energy cards from their deck to any of their Pokemon as they wish, while Lunala's provides an instant KO for one of any of the opponent's basic Pokemon in play.
As these attacks are effectively the TCG's adaptation of Z-Moves, it wouldn't be a massive surprise to see the names being incredibly similar to, perhaps, Z-Moves that are exclusive to the legendary Pokemon?... We'll see.
There will likely be more news revealed at the end of Worlds - perhaps including an announcement of Pokken Tournament DLC following the recent reveal of new characters for the Arcade version? Perhaps an announcement of WTF is going on with Dragonite and Zubat? Who knows.
If you're interested in watching any of the Worlds events, despite TPCi's insistence that that's just silly, the official site at least has you covered with all the live streams.