Well the events in vol 0 clearly tells us that Needless powers are still around in future, thus Arclight failed in retrieving his powers back.
Since Eve is out of action, we now have a new female protagonist - Yamada-ko chan
About Saten inspecting Eve's face and saying " 'IT' has being taken away?" could he be refering to the crystal on her forehead? Since both Adam's and the girl Adam has it, it would be strange that Eve doesn't have the crystal on her forehead.
