Previously, Nintendo showed what it called "Mii WaraWara". It's a redesigned Wii Plaza, with Miis clustered around games and leaving messages. Today, Nintendo announced that the final English name for this feature is WaraWara Plaza.
"Warawara" (わらわら) is Japanese for "bustling".
In the WaraWara Plaza, you can see what other games people are playing -- and talking about. Besides messages, it's also possible to leave illustrations. Using the Wii U Gamepad, you can touch on Miis to see what they are playing and saying.
Nintendo Direct [任天堂]