Update 7/13/16 at 2:20 a.m. Read up on the first details here.
Original 7/12/16 at 11:09 a.m.: The release calendar in the latest issue of Dengeki PlayStation reveals the existence of Samurai Warriors: Sanada Maru for PlayStation 4, PlayStation 3, and PS Vita. It’s listed as due out in Japan in 2016.
Sanada Maru is a TV drama from NHK. We’re guessing Samurai Warriors: Sanada Maru is some sort of collaboration between the Samurai Warriors series and the Sanada Maru TV drama, but that still remains to be confirmed.
Thanks, Sokuho@Hokanko.