The shiny new versions of the paperbacks are now available across Amazon. There was some kind of issue populating Steal from the Devil on the UK site, but this is now fully resolved.
Amazon is selling off remaining stock of the previous versions in some instances. You can be sure you are getting the latest version by checking the relevant book page in this site's novel section: you can follow the links to see each book on Amazon (all the links here point to the latest versions), and ensure the ISBN numbers and cover styles match what is shown on this site.
The most notable differences on the new paperback covers are (a) the author line is no longer in italics and (b) the "Armada Wars" line appears above the book's title, like it does on the Kindle versions.