Late last night, after work, I finally got my mail for the first time in a few days (long story), and as expected, it included my Amazon package with A Cruel Wind (tpb), The Tower of Fear (mmpb), and the just-released A Fortress in Shadow (tpb). This latter is identical in format to A Cruel Wind, and is a handsome publication. The Steven Erikson introduction is highly amusing. And...the Glen Cook list of titles in the front is updated! (though not to include Cruel Zinc Melodies)
So, for the Dread Empire, it mentions A Cruel Wind, and in parentheses says, Containing A Shadow of All Night Falling, October's Baby, and All Darkness Met. For An Empire Unacquainted With Defeat, it says parenthetically that is a "Short Fiction Collection". And for The Wrath of Kings, it states in parentheses, "Containing Reap the East Wind and An Ill Fate Marshalling, and Wrath of Kings"! (it seems that it once read "Containing Reap the East Wind and An Ill Fate Marshalling," and that "and Wrath of Kings" was added later, and somewhat sloppily, especially since the last word "and" is italicized like the book titles)
So it certainly appears that Wrath of Kings as a book has been added to the Wrath of Kings omnibus, as I and others have speculated for a while might happen! We can't read too much into this, no pun intended, but it left me very excited when I noticed this just before going to bed last night. Hopefully some sort of confirming news is released soon, happy reading in the meantime!