Re: DC's New 52: Reviews and Discussion (Spoilers welcolme and likely)
^ That's my impression. Geoff Johns had been talking about Flashpoint for a good year or so before it actually happened. We know that it had been hinted and teased since he started on his run. I just get the feeling they came up with the idea for the relaunch relatively recently and implemented the changes into the book to reflect it.
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Ignoring the The Last Stand since 2011.