Wii Party will come bundled with a Wii Remote when it launches in Europe on October 8. That essentially makes it the new Wii Play.
Whereas in Europe the game cannot be purchased separately, in Japan it'll be available without the Wiimote for $25 less.
Nintendo is yet to announce their bundle intentions for Australia or North America, but we assume we'll have a similar offer to Europe. The question is: do you really need anymore Wii Remotes?