A new news article has been posted!

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Nintendo Japan has revealed 2 new Pokémon Nintendo 3DS themes: Pokémon Peeking Friends (ポケモン ぴょっこりフレンズ), Pokémon Traditional Japanese Pattern 'Poké Crests' and 'Kokeshi Dolls' (ポケモン 和柄 ～「ポケ紋」と「こけし」) and Pokémon Poké Kyun Collection (ポケモン ポケキュンコレクション). These themes cost 200yen each and are available for purchase as of April 27th, 2016 on the Nintendo 3DS eShop store.

Pokémon Calling on Satoshi Gekkouga (ポケモン サトシゲッコウガ参上)

Features: Satoshi Gekkouga is featured on the top screen in the moonlight with the bottom screen showing it in action!
Music: XY - Eye Contact! Furisode Girl (視線！ふりそで)

Pokémon Red and Green (ポケモン レッド＆グリーン)

Features: Pocket Monsters Red and Green 20th anniversary! The two main character "Red" and a rival "Green" appear on a theme! Kamex, Lizardon and Fushigibana also appear on the lower screen with powerful illustration.
Music: Red and Green - Last Battle (VS Rival) [ラストバトル（VSライバル）]

Sources: https://www.nintendo.co.jp/3ds/theme/list/03257/index.html and https://www.nintendo.co.jp/3ds/theme/list/03256/index.html

The Red and Green one looks pretty cool, but I'm not sure the battle music really works as menu music. It's still nice to see some more Pokemon themes being released, though.