Here's what I received as a reply when I wrote to Square Enix in LA.
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Thank you for contacting the Square Enix Customer Support,
We appreciate your positive feedback regarding our past titles. We cherish the continued support from our customers and look forward to hearing your remarks regarding our upcoming games. Our parent company, SQUARE ENIX of Japan, has no current plans to create a another installment to that particular title at this time. This is not to say that it will never happen, it's just that their development teams are currently focusing on numerous other projects.
Thanks,
Square Enix Customer Support
support@square-enix-usa.com
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As for the Japan address, I got it translated by some guy on japan-zone.com:
Square Enix Co. Ltd.
10F Shinjuku Bunka Quint Building
Yoyogi 3-22-7
Shibuya-ku
Tokyo 151-8544
By the way, here's a picture of the building of Square Enix in Japan for those interested. The same dude that translated it sent me the link.
http://www.tokyoarchitecture.info/jp/Tokyo/83.php