I maintain a fork of SRFI 122
https://github.com/gambiteer/srfi-122/
where I've added a few things that were not in the finalized SRFI, specifically the routines
interval-cartesian-product array-outer-product array-assign!
I continue to think about arrays and how to use them. I'd like to get various implementations and applications of SRFI-122 available (beyond what I use it for) and when it looks like I don't have anything more to add I might propose an updated SRFI with the new routines.
In that vein, if anyone would like assistance to modify SRFI-122 to run in their favorite scheme, or to use SRFI-122 in support of their application, I'd be glad to help.
Brad