Bandai has officially announced that they will be releasing 2 new Pokémon tamagotchi's in Japan on January 26th, 2019. Eievui x Tamagotchi - Loveable Eievui Version / Colorful Friends Version (イーブイ×たまごっち　だいすきイーブイver. / カラフルフレンズver.) will be sold separately for 2,484 yen. Depending on how you take care of your Eievui, it will evolve into one of 8 different evolutions. There are three questions marks on the picture below with the dialog that says: "Also, could there be more original Eevee x Tamagotchi forms that they could become!?"

Loveable Eievui Version / Colorful Friends Version

Sources: http://tamagotch.channel.or.jp/tamagotchi/eievui/, http://www.bandai.co.jp/catalog/item/4549660314196000.html and http://www.bandai.co.jp/catalog/item/4549660338185000.html