At Thomann, the BK-7m shows 30 customer reviews, mainly positive. 30 reviews is a high number in comparison to other keyboards at Thomann, it shows it was a good seller.
http://www.thomann.de/de/roland_bk7m.htm#bewertung
I really hope Roland is preparing something, but realistically they seem to have moved away from the BK line, which had been developed by "late" Roland Europe. As they have focused on the low/mid priced market in the past year (there's also a new Roland Juno Di successor!), I guess if they release a new module it will be around the 1,000€ mark.