There will undoubtedly be fan service in it, but there should also be a good amount of battle action in it. I'm looking forward to it.
I just wonder if the story will be Hyperdimension Neptunia > mk2 > Victory, or if it'll take place after the third game (can't be a prequel because of Rom, Ram, Nepgear and Uni). Or maybe it'll be an entirely new story. Will just have to wait and see, I guess.