On the downside I'm wondering whether another new bit (again, not a huge piece of writing and less relevant to the main story than the above) will work. It's confined to the latter parts of the book and won't be hard to improve or axe as is necessary.
I had thought significant rejigging of the chapters would be necessary, but, with one possible exception, they actually stack up quite nicely. That one chapter will need chopping up probably at least into two, with some bits axed and others expanded, but it shouldn't be too much work.
That's largely it, as far as the to-do list goes. Oh, and I need to slightly amend the map (mostly changing lettering). Once all that's done I'll put it through one more major redraft, get anything ship-shape and then put it through a minor redraft (hunting for typos, basically).
Still very much hoping to get it released in the first half of 2013, though the precise timing remains too far off to try and predict.