Manga did include a cropped 16:9 version alongside the 4:3 original in the 10th Anniversary Special Edition release...
I'm sure it'll be fine, though sadly it wouldn't surprise me if Manga somehow contrived to mess this up.
The soup thickens. A post on Facebook
appears to confirm the 16:9 ratio. I've pointed out the technicality that all Blu-rays are 16:9 by definition and that 4:3 material on Blu-ray has to be presented as pillarboxed, and I'm waiting for clarification.
The Manga UK release of Ninja Scroll on Blu-ray will be uncut (the original VHS and DVD release had 53 seconds missing) and it will be in 16:9 aspect ratio. The UK steelbook edition is region locked to B for UK and Europe only. You can only buy it in the UK and Ireland. We are only making 10,000 copies. Extras include Japanese director's commentary (all new), original TV spots and trailers plus a 20-page booklet written by co-author of the anime encyclopaedia, Jonathan Clements. Available to pre-order now from HMV.com, Amazon, Play, Zavvi and The Hut. Out 26-Nov.
My interest in this is beginning to fade though.