A lot of these books were never officially announced/solicited to the direct market, but they were promoted to the book trade because of longer lead time. And now their status has been changed to cancelled.
Showcase Presents Flash vol. 5
Showcase Presents Blue Devil vol. 1
Secret Origins vol. 3
Omega Men vol. 1 (the 1980s stuff)
Injustice Year One: Complete Edition
And the Immortal Doctor Fate TPBis listed as "Postponed Indefinitely." (Like the Omega Men, this is 1980s stuff. The collection of the new Levitz series is still on….).