Not exactly confirmation, but Go Nintendo is reporting that someone from Nintendo of Europe has let slip that Ouendan, the sixth best game of 2005 (NTSC-uk thought similarly), will come to the UK. It’s a pretty safe bet that if that happened it would make it to the US as well.
Personally I hope that if it comes out outside Japan they leave the actual song sequences untranslated and only change the menus into English. Knowing what on Earth was going on might actually be detrimental to the quirky appeal of the game, so they should at least leave the option of keeping the crazy Japanese-ness intact.
Fingers crossed!