Anonedeath, a young girl wearing a pink gothic lolita style dress, is one of Neptunia V’s villains and she has a giant mech with her. Arcdecision (?) is a sinister looking elderly man in a silly robot exosuit.
New for Neptunia V is an informant system which changes the Gamindustri world depending on who you talk to. Informants can make dungeons appear and change what items are available, so I guess this is similar to Persona 2’s rumor system. You can also change the beliefs of people by working with informants.
NIS America has not announced Neptunia V for North America… yet, but considering how Hyperdimension Neptunia and Hyperdimension Neptunia mk2 fared in the market I’d say there’s a pretty good chance it’s coming over.