Beware the Batman/WMG

The reason Beware the Batman is focusing on lesser known villains.

 * is because Batman's more popular villains are appearing in [Young Justice]. It would be an ironic reversal of the infamous bat-embargo that prevented Batman villains from appearing in [Justice League Unlimited] because they were appearing [The Batman], but this time it is the Batman series that can't use Batman's rogues gallery.
 * Joker, Riddler, Clayface, Poison Ivy, Ra's al Ghul, Bane, Mr. Freeze, and Hugo Strange have all been used in Young Justice, so they won't be allowed to appear in Beware the Batman until YJ ends. Beware the Batman can probably still use the rest of Batman's rogues (Catwoman, Penguin, Mad Hatter, Two-Face, Scarecrow, Killer Croc, etc...), but they brought in some lesser known rogues to make up for the ones they can't use.
 * This would also explain why Katanna is being used as Batman's sidekick; they can't use Robin, Batgirl, or Nightwing because they are all featured in YJ.