It'll probably be like the post-Infinite Crisis continuity, where they just kind of cherry-picked what stuff they wanted to bring back from pre-CoIE, what stuff they wanted to keep from post-CoIE, what new stuff to bring in, etc. I imagine when they inevitably undo the reboot (my guess is so it'll line up with Detective Comics #900--no way in hell they'd skip out on that milestone), it'll be a mish-mash of pre- and post-reboot DCU.
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