The Wii Fit U trial is actually valid for 30 days of USE, not just 30 days of it being downloaded. Offer still expires in January! #WiiFitU — NintendoFanGirl (@NintendoFanGirl) November 4, 2013

That's an even better deal than I realized. I thought it was 30 days after download and then you'd have to pony up some cash.