I'm interested in this film as well, it was initially posted here a couple of months ago actually, but nobody seemed to know anything about it then:
(there was a url link here which no longer exists)
It's been available from Japan on Ebay for a while now but I've been holding out hope that Freestyle will start selling it (I'm in the US so shipping costs are quite high otherwise). I'd love the opportunity to shoot some color slide film through my Yashica 44!
This film is sold as E-6/CR-56 product (see sticker on the film can), therefore I think some Fuji slide film was cut and packed for 127 format. While I initially thought, that Rerachrome simply cut rolls of 120 format film back to 127 size, this Rerachrome allegedly uses a polyester base, whereas Velvia and Provia film in 120 format uses Cellulose Triacetate film base. The only current Fuji color reversal product using polyester base is Velvia sheet film, which tells me that Rerachrome must have been cut from a sheet film master roll.
Ah well.... I have a Komaflex S, one of the few 127 SLRs ever made. I bought it in the early 60s and enjoyed its excellent performance on BW and also the wonderful SuperSlides on Ektachrome. Sadly it needs a thorough CLA, which is quite expensive. If film were readily available and economical I might well go for it. But as it stands, I'll just wait and see.