NIS America sent out a few videos of Prinny 2: Dawn of Operation Panties, Dood! with English voice acting. Did you see the clip with Flonne and Etna posted above?
It sounds like both characters have new voice actresses.
These other two videos show Hero Prinny pummeling Bok Choy, one of the game’s bosses. It looks like a breeze, but unless you play it on "baby easy" Prinny 2’s panty retrieving quest is most definitely not.
Update: I stand corrected! Nick says in the comments that the voice actresses are the same.