I have the same question lol

I heard that it's on 3DS, but is it also on Wii U? I use my Wii U more than my 3DS nowadays

I just checked the HB App Store for new homebrew, nothing. So I think is for 3DS only. I'll go check Universal Updater

Yeah, actually the description says "Chatting application for 3DS and Wii" Not Wii U, Wii.

But you can use through vWii so.

I installed, I thought it was a app to chat with your friends only, but the chat is public. Very cool, I say!

I hope the Wii version has USB keyboard support!

Idk, it seems to be in a very early stage.