While there's nothing particularly new about interactive kiosks dispensing coupons in retail locations, the business model described in this article at Kiosk Marketplace makes it seem pretty unique. Acting as something of a broker/clearninghouse for all sorts of coupons, the Matthias MoneyBoard machine and back-end system will allow vendors to pre-purchase coupon "slots" on an interactive kiosk for up to a year at a time. Presumably they're allowed to change the terms of their offer over that period of time, since I don't think I've ever seen a coupon that has run for quite that long :)
The inventor says that his way of dispensing coupons is less wasteful (as opposed to free standing inserts in newspapers), and reaches a greater percentage of interested shoppers, which translates to an up to 50% cost savings over traditional couponing methods.
While I can't vouch for that statement one way or another, the clearninghouse model makes sense to me. The real question would be whether or not people would wait to get to a machine, rather than looking for comparable offers on the Internet, from the comfort of their own home. Still, it might be a good vehicle for brand conversion or incremental sales. If it takes off, we'll certainly be hearing more about it.