Biggest book of 2013 ?

       So with all sorts of the-year-ahead-in-books previews out it looks like one of the -- and arguably the -- publishing event of the year has thus far been almost entirely overlooked. At 2672 pages that would seem hard to do, but those showing us the way ahead into 2013 apparently didn't stumble over it (or don't think it's worth your while -- which, given the considerable while involved in reading it, seems plausible).
       Sure, size isn't everything -- but the first complete translation of Giacomo Leopardi's Zibaldone (with seven listed translators) would be an event of outsize proportions even if there were a dozen books appearing this year that dwarfed it physically.
       For some background, see the University of Birmingham's The Zibaldone project page and the Arts & Humanities Research Council's interesting feature on Translating the 'Zibaldone' -- where, for example, one of the editors points out:

In fact, the work can also be read as a very early example of a non-linear text. Any single entry can be connected to one or more others: the book is a kind of net. Indexes are indispensable here, and Leopardi even made one of his own. The actual content of the diary, with its pitiless analyses of modernity, ranges from philosophical and moral questions, questions concerning man, nature and society, literary matters of course, the special status of poetry, through to scientific, political and linguistic issues

       It's due out in July in the US, from Farrar, Straus and Giroux, and in the UK apparently from Penguin in September; pre-order your copy from Amazon.com or Amazon.co.uk.
       (In the FSG catalog they promise, under 'marketing', that they'll have: "Author Appearances", so I'm very much looking forward to those .....)