Someone got Tamagotchi Plaza a few weeks early. No Uni connectivity shown off yet, but it seems like the device has some life left in it since the entire playable roster and most of the NPC lineup comes from it, along with the fact that you can link the two of them up for bonus items (the same way Corner Shop 3 and Ninki no Omise let you get content for the Connection V4 and M!X respectively).
https://www.youtube.com/watch?v=Qu00ZXp1R5M
Will say, I do miss the old games' 2D artstyle a lot, something about the models doesn't quite feel right.