Exactly the extent to which we will be seeing the eight film series, the first three of which are known for the inclusion of Raizo Ichikawa, it's not known -- the company touted as releasing these films shall, by my lips, remain nameless because they're delving into the realms of not doing a particularly good job, so I would hold off on this and other stuff of theirs until each one plops out a few reviews I can be sure of.
For now, others can talk about this far more eloquently... no official subbed DVD has so far appeared; the HK discs of the films don't seem to have English Subtitles on them. Yes, 'Lone Wolf and Cub' Star Tomisabaru Wakayama is in here somewhere.
Raizo Ichikawa & Shinobi No Mono Series Background Information at SamuraiDVD.
Shinobi No Mono Listing for Conformation, via DVDManiacs.net forum.