Honestly if I were Nintendo I wouldn't market it too much either. I don't see it having much sales potential and if they're going to promote one niche game, they should promote Pikmin 3.
From a gamer perspective we'd like to see games such as TW101 & X get promoted but from a business perspective it makes a ton of sense to save the money for Pokemon X&Y, Wii Fit U, and Super Mario 3D World.