Honestly, at this time I suppose than Bendis would had becoming the next EiC in Marvel, but this is really unexpected. But, well, Jack Kirby left Marvel too and created Darkseid and the 4th World.
Honestly, I don't know what will happen. Bendis is no saint of my devotion, and his dialogues are no my taste. Some people are "Yeah!!" other people are "Noo!", either DC or Marvel, but for sure this news had left no one indiferent.
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