Dengeki Online posted a high-res version of the boxart for Taiko Wii U (the one with the bundled Tatacon) and goess what's on its side! Yep, another big piece of the default songlist! (click to enlarge)
From this shot, the new songs are:
J-Pop
Tsuki to Taiyou (月と太陽)
Yoru no Odoriko (夜の踊り子)
Chocolate Disco (チョコレイト・ディスコ)
Kiseki (キセキ)
Natsu Matsuri (夏祭り)
Anime
Gachi de Katsouze! (ガチで勝とうゼッ!)
Happy Go Lucky! Dokidoki Precure (Happy Go Lucky! ドキドキ!プリキュア)
Rocking Heart (ロックン・ハート!)
(DL) Miracle Travel (みらくる☆トラベル) (erroneously we called this 'Tamagotchi Miracle Friends', that is actually just the name of the series)
(DL) Sanpo (さんぽ)
Vocaloid
Jinsei Reset Button (人生リセットボタン)
Ninjinnin (にんじんにん)
Game Music
Overture X (序曲X)
Dragon Ball Heroes (ドラゴンボールヒーローズ)
Nanairo Button (七彩ボタン)
(DL) Walking Through The Towers
The songlist will be updated soon! Look forward to more exciting Taiko Wii U news!