Tumblr fans and other citzens, you can stop guessing!  I have figured it out!  Nna Leckie’s new book is entitled SIGCIFINANCE, as clearly evidenced by this exclusive leaked cover image complete with testimony from Translator Spliin!

A very fine collection of words if I do say so myself,
which, I believe, probably, I do.

So happy to put this mystery conclusively to rest, and very excited to see if other parts of the cover released by orbiting publishers are for this same book, or perhaps another book entirely!