It was announced at the "Sengoku Musou" 10th Year Anniversary Announcement Event that the game "Sengoku Musou" will be animated and be broadcasted on TV in March 2014 as one hour special. The title is "Sengoku Musou SP: Sanada no Shou." The anime adaptation is to celebrate the 10th year anniversary, and the content centers around the final battle of Ueda Castle. It will also be included in Blu-ray form in the "Anime Box" and "Treasure Box" versions of the PS3 game Sengoku Musou 4, to be released on March 20, 2014. More information regarding the anime will be announced later.
Sources: Official anime announcement
Sengoku Musou SP: Sanada no Shou