Taken from 1up preview:

Late last year, Suda mentioned in an interview that he was interested in adding support for Nintendo’s Wii MotionPlus peripheral to the game, presumably to allow for more precise attacks. But he now tells us that this idea didn’t end up making the cut, in part because of the next entry on our list.

Grasshopper’s tradeoff for leaving out MotionPlus support is that they’ve included a Classic Controller option. Given that No More Heroes 2’s minigames are presented like classic 2D games, this makes a lot of sense, but you’ll be able to play the whole game on the SNES-style pad — not just the minigames.

As it turns out, Grasshopper’s motivation for this had less to do with the mingames and more to do with the popularity of Capcom’s Monster Hunter Tri, which many people in Japan play using the Classic Controller (and was even packaged at the same time as the Classic Controller Pro). According to Suda, Grasshopper — and Japanese publisher Marvelous — wanted to support this controller to appeal to those players.