This comes directly after updating the recent Miiverse Nintendo Netword ID update, does anyone know what has changed in the Mii plaza?
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StreetPass Plaza Update
There is also an update for StreetPass Plaza which takes it to version 3.3. The update is relatively short but makes no noticeable different to the app; as it visibly connects to the Nintendo Network ID we suspect this is merely implementing the ID data into the app.
Sincerely stolen from Nintendolife.com