Three Kryptonians on Earth?

In Action Comics #842 the Alien that is abducting Earths Meta-humans said his scan picked up 3 Kryptonians. Which Shocked Superman cause he thought there was only him and Supergirl. So who is the 3rd Kryptonian? I think maybe it's Supernova or maybe Connor.

That's thrown me for a loop as well. The Eradicator is in a kryptonian body so he's one choice. Maybe Powergirl?

Doomsday

-Is it comprehensible....

Well this Alien seems pretty high tech. I think he is implying there is 3 "real" Krytonians on Earth. I think there Busiek has a twist somewhere coming up.