I wasn't aware that it had been reissued either -- until I saw it on Dusty Groove's site. According to Discogs, it was reissued in January of this year.
I'm super-stoked that it's available again. I'm not a Japanese jazz expert, but it's definitely one of the most compelling J-jazz albums I've ever heard.
EDIT
The down-side of the reissue? Like many Japanese reissues, it's not cheap. It cost me nearly $50.
OTOH, the one original Kiso listed on Discogs is priced at $1,649. 😬