This is the sequel to Spellwright, and it's due out in September. I guess you could read it without Spellwright and catch up reasonably well, but I think it's a much better idea to read both if you're interested.
In some ways Spellbound has a very clear genre place. It's an adventure fantasy, it has fairly straightforward prose and fairly straightforward characters, there are occasional but not highly obtrusive puns--it fits in with a bunch of other things, and you'll like it if it's the sort of thing you like.
The place where these books--Spellbound even more than Spellwright--really stand out is that Charlton has used not just his knowledge of the body from being a med student but his approach to the body, to ability and disability, to healing and its frustrations and failures. I don't recall another book that handles disability in quite this way in its major characters, and I think it's really well done. I'd like to hear from other people who read this series and have different experiences of health/disability than mine. If you're not opposed to adventure fantasy, it's a good read.