Others here may already have heard about this (in fact it may even have been posted here already - in which case please forgive me), but I found out only yesterday about a gent called, Bob Crowley, who is trying to,
"...enable the supply of a very high quality 4x5 (and possibly 8X10) negative material, for artistic purposes, that can be easily field processed, such as so-called "instant film" of discontinued Polaroid type 55, and get this to happen any way we can! We will need your help to make it happen."This sounds great to me. I'd even settle for the lack of 665 if they could make a 55 equivalent. Anyway, I'm looking into it and reading Bob's archive so I'm still not completely up to date on hwo far he's got, who he's working with, what they think their chances of success are, but for those interested go take a look at
http://new55project.blogspot.com/ You can also follow Bob on Twitter. He's
@bobcrowley.