In an official Nintendo interview, producer Minae Matsukawa stated outright that the team is "in the middle of localizing it right now." It's playable, and they just need to make some final adjustments on the text. After that, it should be all systems go for Europe, in multiple languages.
The only problem? Still no release date, which is all kinds of suck. Non-English-speaking fans will have to put up with the wait just a little longer, while all others might be better off shopping around online. Then again, if you go through those channels, you've probably done it already. Good for you!