Sadly, the main reason I suspect you haven't heard from the publisher, CB, is that they're afraid you're going to ask them for {GASP!} some sort of financial remuneration. In that game, even a comp copy may be a stretch for them, as anything that might be tacitly or implicitly taken as an acknowledgement on their part of any substantive contribution by you (or anyone apart from Tom Andrae-- and unless his doctorate is in "Comics" from whatever institution might spit those out, it has as much weight as Bill Cosby's PhD has on his credits for a sit-com. End of screed.) might be used in some evidential way in a claim against them for compensation. And from their description, they're looking at this book as being primarily for the library market -- including educational institutions-- no matter how many of us are frothing at the mouth to see a collection of Kelly work given what we can inly hope is the loving attention the work deserves (as opposed to the sort of half-assed attention PS Artbooks gave to the Stanley Morse reprints. Don't get me started), and that will mean a lower print-run and a higher price, but not a great source of cash-flow for a publisher of any size, even if it will end up being more cash-flow than any of us are getting for our efforts here.
And besides, these are just the sorts of things that corporate lawyers do to make the money Publishers and others fork over, bless their hearts.
Good news anyway, we'll see what it turns out to be when it slides out into the world.