Neptune mk2, the sequel to what the West knows as Hyperdimension Neptunia, has its first trailer which Compile Heart has released on the official website. Andriasang has it up on YouTube and you can check it out below.
The game features a whole new cast: Nepgear, Uni, and the twins Rom and Ram. They're all the little kid sisters of the previous game's Goddesses with Nepgear as Nepnep's little sis. She's derived from the Sega Game Gear, while Uni is sister to Black Heart and is from the PSP. The twins are the younger sisters of White Heart and are from the DS (because of the dual screen feature).
Don't ask about Green Heart, she doesn't have a little sister for reasons that should be clear if you follow the game console race.
The world looks a lot more open in Neptune mk2 compared to the original game which featured a lot of corridors. The game is out sometime in August on the PS3. NIS America have yet to say anything about publishing it in the West, despite announcing the sequel to Atelier Rorona and Cladun. They're also bringing Bleach westward.