The trailer shows that the selection of Pokémon you can play as has been greatly increased since Pokémon Mystery Dungeon: Gates to Infinity. The Direct also revealed that the game will be released in Japan in September.
I agree with you, Gates To Infinity lacked a lot of things including the ending which had nothing else for you to do, only work on your special Pokémon Paradise and that's about it. Super Mystery Dungeon however looks to be the last dungeon game they will make, I honestly don't know for sure, but It will be better than the last game obviously.im a bit excited and worried at the same time. im excited at the fact that we get a new installment in the series but im worried that this will have somewhat of the same fate as gates to infinity. i hope this game will end up well and be overall worth it