The Famitsu scans have revealed that the game will be heading to retail, not XBLA like last time.
SEGA has stated it would upgrade the game to HD and add Xbox Live support. Which is not really new, since the XBLA title featured this. Maybe they will re-do the textures? They will also have a mission mode where you can pick up items, though what they do is not specified. Mission Mode is made for single player, but can be played co-op. Also co-op boss fights.
Game, as of now, is 30% complete and is slated for a winter release in Japan. As for the west, no news if we will be getting it. I think this is just SEGA Japan cashing off the success of VOOT, would not be shocked if a cheaper, XBLA version is announced for the west.