Deathstroke, The Fury of Firestorm: The Nuclear Man, The Ravagers, The Savage Hawkman, Sword of Sorcery and Team 7 all canceled and will be wrapping up their respective runs in May.
Ending in April are I, Vampire and DC Universe Presents. Right now, with Scott Snyder's Man of Steel, Justice League of America, Vibe and Katana coming down the pipeline, that still leaves 8 spots open (with one of those going to Man of Steel, probably) thanks to previous cancellations so look for new title announcements to appear in the coming weeks. Specifically, look for two new titles to debut in May and five to premiere in June. In one of the links below, you'll find some of my suggestions for replacement titles.
THE FOURTH WAVE
Cancelled: "G.I. Combat" cancelled in December. "Blue Beetle," "Grifter," "Frankenstein: Agent of S.H.A.D.E." and "Legion Lost" all ended in January
New Series: Threshold #1 (Jan 16th), Justice League of America #1 (February 20thth), Katana #1 (February 13th), JLA's Vibe #1 (February 20th), Constantine #1 (March 13th )
THE FIFTH WAVE
Cancelled: I, Vampire and DC Universe Presents ending in April, Deathstroke, The Fury of Firestorm: The Nuclear Man, The Ravagers, The Savage Hawkman, Sword of Sorcery and Team 7 end in May
New Series: Snyder and Lee's Man of Steel, ???
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