Altus Press has announced that The Black Bat Omnibus Volume 2 will be available Spring 2013.
From Altus Press:
Thanks for your patience on this one... it' been partially done since late 2009!
The Black Bat Omnibus Volume 2
By Norman A. Daniels
Contains the next three Black Bat adventures: "The Black Bat's Challenge," "The Black Bat's Spy Trail," and ""The Black Bat's Crusade." 400 pages, $29.95. Coming later this spring.