I don't know how I feel about this. In one sense this is more content than you'd expect from a regular post game and it's better than getting an ultra sword next year. In another sense the base game was lacking content in general with its basic routes and lack of dungeons or worthwhile optional content, and of course having essentially no post game content and less Pokémon.
The fact that it's all Wilde area is kinda cool, but only if the performance is good and they fill them to the brim with content, npcs, trainers, mini games, secret dungeons, etc. And I don't have high hopes for that.
Also I'm already the champion and all my Pokémon are level 100 and fully trained. What are they gonna do about that?