A TRAIL OF FIRE is available for pre-order!
The book is only going to be published in the UK, Australia, and New Zealand.
Please read Diana's explanation below, taken directly from a post on Compuserve.
This collection is going to be peculiar, because of the rights issues. To wit: we can't legally publish these stories in North America until the rights to all of them have reverted--and each one has an exclusive period of 12-18 months (depending on the original contract) from first publication in the anthologies until the rights _do_ revert to me. So right this minute, "Custom" is the only one I could legally sell again--but the rights to "Leaf" come due this October, and "Plague of Zombies" next April (2013).The first of those "e-shorts", "The Custom of the Army", was published in the US and Canada on May 21, 2012. Look here for details.
However--owing to a lot of complications and negotiations you don't need to hear about <g>--we _can_ publish a printed collection in the UK when "Leaf" comes free. So there _will_ be a print volume coming out from Orion in October of _this_ year--but _only_ in the UK (and its Commonwealth countries--i.e., Australia, New Zealand, etc.). (You can still get the book in the US, but it would be expensive.) So meanwhile, we have it in mind to publish the individual stories in the US/Canada as individual e-shorts (sold inexpensively) as the rights revert, so that US readers can _get_ the stories as they revert without waiting until _all_ the rights revert and we can do a print collection--we couldn't do print in the US until (probably) early 2014.
Please see Diana's blog post here for all the details about A TRAIL OF FIRE and the individual e-versions of the shorter pieces.
Here are the pre-order links from the website of Orion Books (Diana's UK publisher) for A TRAIL OF FIRE:
Here's a site in New Zealand that is listing A TRAIL OF FIRE for pre-order. And a site in Australia. I would think it's going to be available through the major bookshops in Australia and NZ, just as all of Diana Gabaldon's books are, so please check with your local retailer or online bookseller.
And finally, here's the link to the pre-order page on the Book Depository site. I've never used the Book Depository, but I've heard good things about them, and from what I understand, they ship worldwide. This might be a good option for fans who live outside the UK/Australia/New Zealand who want to get their hands on the book as soon as it's published.
A German translation of A TRAIL OF FIRE will be available at some point in the future, but I have no further details.
It's still early yet, and the information above is subject to change. I don't know anything more about A TRAIL OF FIRE than what I've stated here. I will post further updates as more details become available.