The official release date for War Time is February 6, 2012, but books should ship early enough for spring course adoptions. (Books usually start to ship about a month before the pub. date.)
I've received queries about this, so I asked the press about what to tell teachers who want to assign the book for spring 2012 courses. OUP advises that you place pre-orders with OUP. That way copies will ship to you as soon as copies are available. I'll post updates about this on the blog closer to the release date.
In the meantime, if you need more information about the book, please take a look at this site, which will be updated as more book information is available. Also, you might find it helpful to read the essay that led to the book, which can be downloaded for free from this site. The book goes well beyond the essay, of course, and is written in a way that will (I hope) appeal to a broader readership than the law review essay.
If you need more information, please contact me.