Given that Johns tends to plans things out relatively far in advance, if the bow tie retcon is real, we might have seen indicators of it in Booster Gold 4. (In comparison, the Sinestro's daughter retcon which is taking place in a similar point of time, did show up in Booster Gold 1.)
I'm even willing to believe that Johns would fake an interview to sell a plot point if necessary. I know DC faked interviews to the effect of "No, we really did kill Booster Gold in 52."
It's possible that I'm very wrong with how things are going to turn out. If I am, I'm willing to admit that after seeing another couple of issues. Basically I'm in wait and see mode.