Google Alert tells me of a page http://news.pspublishing.co.uk/2009/08/03/midsummer-madness-60-off-pre-2008-titles/ which apparently says:
"We've been busy as usual with new purchases, including a limited edition of Gene Wolfe's new novel, The Sorcerer's House, due out next March. Told entirely in a series of letters, the result is a bona fide page-turner. ..."
We already knew all that, but limited editions are always fun.
Another fun link is http://kleinletters.com/Blog/?p=4900 on A Walking Tour of the Shamles where Neil Gaiman comments that "One of us wrote four pages and sent them to the other, who wrote four pages and sent them back, and so on until it was done."
gwern