The release estimates are Q1 and Q2 of next year, so if there will be pre-orders (there were for some releases of D2:ED and DKS), I wouldn't expect them until an actual date is set and distribution organized (Larian already has distributors in a couple regions, at least).
Many thanks. I am just finishing off ED and about to play FoV, and cannot wait for the others to be released. Based on the richness of DKS, I am actually pleasantly surprised both are expected within 12 months (more or less) from now.