The ending will remain substantially unchanged, but there is one particular thing I'm tweaking (I shan't say what at present). As for your question, Bloodmire is already a standalone spin-off from a 120,000-ish word fantasy novel I wrote about five years ago (still not published, but it's in very good shape and I'm very pleased with it). Bloodmire features one supporting character from the novel, also in a fairly minor role (the priest who rescues Sir William, after he is attacked by bandits). The incidents in Bloodmire have nothing to do with what happens in the novel. :)