Official site - http://download1.gamecity.ne.jp/sengoku2m/index.htm
Promo video - http://www.youtube.com/watch?v=DDTsYKjjeYE
New characters - Motochika Chosokabe, Toshiie Maeda, and Gracia (who, I've been told, is Mitsuhide's wife!? O_o).
Non-playable characters that are now playable - Katsuie Shibata and Kojiro Sasaki.
Re-introduced character - Yoshimoto Imagawa.
The designs are GORGEOUS, although I'm a little upset that they kept Katsuie looking much like his Kessen III self, but made Toshiie entirely different. 
*Melanie loves Kessen III Toshiie*
I LOVE Yoshimoto's new look... but hell, I just love Yoshimoto! 
