Nintendo gave the 3DS hardware a makeover. Kyary Pamyu Pamyu handles all the characters. Visit chrislovesjapan.com for more content.
Raw video taken from the "Nintendo 公式チャンネル" channel.

SONG: KISEKAE by Kyary Pamyu Pamyu
Kisekae means such things as changing clothes of a doll, electronics skins/cases, etc.

My transcription of the audio:
着せ替えちゃおう！
着せ替えちゃおう！　New　ニンテンドー３DS

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