According to the MADHOUSE official website, a continuation of the Ninja Scroll series was announced under the name Ninja Scroll Project. This project is related to Ninja Scroll (movie)
directed by Yoshiaki Kawajiri
, and its sequel, Ninja Scroll: The Series
. A news flash announcing the start of the project with 3 short specials was aired at Sakura Con in Seattle WA, which was held between April 6th and April 8th.
Source (Japanese): MADHOUSE official website