If this movie was to retcon anything, only the reboot should be retconned. If anything from the reboot should get retconned the most, it should be the Power of Four, or pretty much anything else with Bliss, because that way it will mean Bliss never existed and therefore she won't be getting in the way of Bunny's return. However, I think this movie should ONLY retcon the reboot and not retcon seasons 5 & 6 of the original series because I'm sick of people bashing those two seasons and I want to prove that those two seasons are still canon, lame quality or not.