According to the official Nintendo site: http://wii.nintendo.co.uk/18542.html Zack & Wiki won't appear on this side of the ocean in 2007.
I have to say it really starts to annoy me. We had Metroid 2 weeks ago, but I'm not a big fan of the series (that means I love the game, but unlike Zelda I don't get lost in it). I was really waiting on Z&W and Fire Emblem but they're both postponed. Of course we get Galaxy, but besides that I don't know what to get (maybe a 360, they take good care of Europeans).