Platinum members can choose between playing cards, posters, a calendar, and a free game, while Gold members are limited to the calendar or a game.
UPDATE: The prizes are now live.
The prizes for the 2011-2012 North American Club Nintendo year were revealed early this morning and then promptly taken down. It's still very likely these are the prizes, but there could be tweaks when it finally does go live. We'll let you know when the prizes go live and you can make your choice.
Folks who earned 600 coins or more in the previous Club Nintendo year, which ended June 30, have a variety of choices for their Platinum prize. There is a set of three new posters, featuring designs from The Legend of Zelda: Skyward Sword, Kid Icarus: Uprising, and Luigi's Mansion: Dark Moon.
The other Platinum-only reward is a set of Mario playing cards that appear to be slightly see-through.
The Gold reward (for members who earned 300 to 600 coins), which Platinum members can also choose, is, like usual, a 2013 calendar that will likely feature images from Wii U titles such as Nintendo Land and New Super Mario Bros. U as the promotional art teases.
Alternatively, Gold and Platinum members can pick a downloadable game for Wii or 3DS as their reward. The options are Super Mario Kart (Wii Virtual Console), The Legend of Zelda: Majora's Mask (Wii Virtual Console), Metroid II: Return of Samus (3DS Virtual Console), and Mario vs. Donkey Kong: Minis March Again (DSiWare download on 3DS). All of those games except for Metroid II were featured as Club Nintendo games that you could download using coins in previous months.
In previous years, Club Nintendo Platinum members could get a Mario pin set (2010-2011), a Mario figurine (2009-2010), and a choice between a Mario hat and a Punch-Out!! WiiWare game (2008-2009). In all previous years, Gold members could only get a calendar.