Nintendo reportedly posted its 2012 Club Nintendo Elite prizes briefly, before taking them down. The evidence remains in a screencap taken by NeoGAFfer Pappasman and a post on IGN, revealing the prizes that "Gold" and "Platinum" status holders will be able to choose this year.
The Platinum-exclusive prizes include a fancy Mario playing card set or a collection of three posters. Both Gold and Platinum have the option of the usual desk calendar, or – a first for the Elite prizes – a Virtual Console game (Super Mario Kart, Metroid 2, Mario vs. Donkey Kong: Minis March Again, or The Legend of Zelda: Majora's Mask).
All of these games are available on the normal Wii (or 3DS) shop, so we only recommend opting for one of those if you really, really don't like any of the exclusive prizes.