3-4x in hardware power over Wii U, supports Unreal Engine 4 and all that jazz, and another source saying Nvidia Tegra.
I'm guessing that would have to be in "home mode", 3-4x the Wii U in portable mode would be pretty crazy.
I guess that's decent considering it's Nintendo and the hybrid nature? Could've been worse knowing Nintendo (like literally just Wii U level).