Constantine writer Robert Venditti and Birds of Prey's Jim Zubkavich have both been removed from those titles before they began.
Animal Man and Green Arrow writer Jeff Lemire and Ray Fawkes will instead tackle the new Constantine series, which brings the character completely into line with main DC continuity.
Amethyst writer Christy Marx will instead tackle Birds of Prey.
Veteran writer Jim Starlin will replace Peter Milligan on Stormwatch.
Fawkes will serve as co-writer on Constantine instead of penning his previously solicited two-issue Batgirl story following the return of Gail Simone.
All of the New 52 titles will feature fold-out covers in April, many of which will apparently conceal spoilers for their respective issues.