They do exist and the reason that people aren't talking about them is because there isn't much to do with them. At least with Version Two's, you can shop, connect, and get codes, but on Mini's, you can't do any of that stuff.
DarkCore's right. Tamagotchi Mini may be cute, but even BanDai said that it's more of a decorative keychain than a fully functional Tama. Basically, my Mini's life-cycle is: Babytchi, Nyorotchi, DEAD. RESET....etc. Not really exciting enough for a topic.
But if YOUR Mini does something sweet, then you can always make your own topic about it!