Author's Saving Throw: The announcement that Booster Gold and Ted Kord's Blue Beetle will be joining the book, and that it takes place not in Prime Earth but a variation on New Earth, has been met with high praise in comparison to the Darker and Edgier tone that has been given to the book to that point.
The revelation that this is not the future of Prime Earth leave it open for the Legion of Super-Heroes to reappear.
Epileptic Trees: From the moment the character designs were unveiled, fans began speculating that Wonder Woman and the Flash were the absent-since-Flashpoint Donna Troy and Wally West purely because the Flash had red hair and green eyes, two of Wally's distinctive characteristics.
Replacement Scrappy: How many Legion fans view the team and the entire book, replacing a long running team with a multitude of characterization, storylines, and more than a few POC and LGBT characters in its roster, for another Justice League knock-off title during a time when DC is becoming over-saturated with them. This got worse when solicits for Justice League 3001 revealed an evil version of the Legion would be appearing, working for Lady Styx. Since there still isn't a Legion book at this point, distaste for this series among Legion fans has grown.