They should't "errata" these new cards to make them legal. The point of an errata is to provide clarity to an effect, not to change it drastically so its less OP. Keep the cards that are too broken banned and let the traditional and unlimited players have their fun.
Also Konami has stated you can use older verisions of the new card provided you bring a sheet explaning its new effect or something like that
That feeling when your opponent activates Cursed Seal of the Forbidden Spell on your gem-knight fusion/qliphorth scout/ mask change.