Just a heads up, both Waterstones and Foyles Bookshops now have The Colourless on their order system. If you're near a branch of either of them, and you haven't got around to getting a copy yet, just pop in and ask for The Colourless, or you can visit Foyles website or Waterstones website to have a copy delivered to your local branch.
Quick update on the rest of the series, I have finished the first draft of Devil's Moon and made a good start on the fourth book (tentatively called Dragonmage, this may change in future). I'm currently working on the edit and rewrite of Beyond the Serpent Hills, and if all goes to plan I should have it published around this time next year.
Kitty