Sega has released screens of the opening for Sakura Taisen 4; as you can see, the new koubu differs radically from the normal type we're accustomed to. For the first time, Ichiro Ogami will sing the opening song, though he'll be backed up by all thirteen female characters during the chorus. This is a first, as the opening in the first three games was always performed by one or many of the female characters.
Sakura Taisen 4: Maidens, Fall in Love! is due for a March 21st release in Japan. A US release will happen say...never.