According to the relavitely credible post of a moderator of the French Keyboards Fan Club (3,000+ posts) , who obviously had the opportunity to talk to senior representatives of Ketron ("Sandro"?), the SD40 is supposed to be significantly cheaper than feared, around 1,100 euros in Italian prices, the SD9 is supposed to be just under 3,000 euros.
Availability of the Sd40 is supposedly planned for June.
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http://keyboards.leforum.eu/t12596-KETRON-pr-sente-le-nouveau-SD9-SD80-et-SD-40-Francfort.htm#p95606