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Game Freak is finally breaking free from conventions set by all the other Pokemon games, like removing the gym and Elite 4 system. The introduction of Alolan variants offers a new twist on familiar favorites, and the QoL changes (displayed type effectiveness, displayed stat buffs / debuffs) also do well to make the game more accessible and a better experience for the player. Plenty of the new Pokemon revealed so far also have quirky gimmick abilities, which if nothing else should draw player attention to what abilities their Pokemon have.
On the whole, plenty to be excited for. We'll have to see what tomorrow brings.