Question: Will Kirby’s Extra Epic Yarn for the Nintendo 3DS feature a stereoscopic 3D mode?

Answer: No. The box art states the game "plays only in 2D."

Editors opinions: It's a bummer Nintendo opt to exclude a stereoscopic 3D mode because most of the environments features a simple color palette with a flat background, as seen in the trailer below:

While most of the environments wouldn't look good in stereoscopic 3D, there's a few that would have looked stunning with extra depth.