This has been in the works for a long time, but it's good to have these details come out. Especially the introduction by Grant.
At the very least, I take it as a good sign that DC's using a currently popular writer for the introduction, rather than an artist -- Kirby's visual strengths have never been questioned, unless you're Art Spiegelman, in which case you're a miserable bastard and I don't want to know you -- or someone who'll damn him with faint praise as an "idea man" who needed a collaborator to crush all the life out of his work. You know the drill: great characters, shame about the writing, what we need here is a steady workman like Gerry Conway to hammer it into shape because Orion needs an insignia on his chest to be a proper superhero...
I've been waiting a long time for Jack Kirby to be fully appreciated as a writer by other comics writers -- while watching folks I otherwise respect, such as Steve Englehart or Gail Simone, utterly trash him for not being sufficiently "naturalistic" for their unaccountably narrow tastes -- so far Peter Gillis is one of the few writers to step up to the bat and get what Kirby's writing is all about. But by all indications, Grant gets it too. It'll be interesting to see what he says.