johnny mnemonic - directors cut?

Being a very big fan of William Gibson, and even owning the proto-Matrix, Keanu-starring, but pretty tragic Johnny Mnemonic on DVD, was very interested to see this blog entry from Gibson talking about what JM could have been if Sony hadn't hacked it around so much in post-production. Grr.. most interestingly, though, it mentions a Japanese cut of the movie that's different to the Western one. Apparently, it's 15 minutes longer than the US release. Would be amazing if I could get hold of it somehow, to analyse the differences and add it to my random Gibson collection that includes the Johnny Mnemonic PC CD-ROM (it's a FMV adventure, with a completely different cast including Isaac Hayes and Julie Strain!)