This in a nutshell:
http://emertainmentmonthly.com/2014/...s-convergence/
3. Superboy?
Why yes, that is indeed two Superboys fighting each other, and surprisingly that is the least weird choice made for Superboy’s New 52 reboot. The main Superboy (Conner Kent AKA Kon-El) is a clone made from Superman’s DNA by Secret Evil Science Collective #75623 who broke out after figuring out they were training him to be a human weapon. Alone, that’s more or less the original Superboy origin, but throw in the double and everything gets really weird. The other Superboy is one Jon Lane Kent, the future son of Superman and Lois Lane (????) who is insanely powerful due to being born under a yellow sun. Unfortunately, he fell severely ill shortly after birth (human and Kryptonian genes don’t mix well), and was whisked to the past (our present) by evil time-traveler Harvest, who stabilized his condition by genes extracted from the clone Conner Kent (this is apparently the real reason he was created) and raised Jon to be his true ultimate weapon against metahumans. So, Conner’s escape understandably drove Jon on a mad rampage, as his DNA is the only thing keeping him alive, and that’s why we have two Superboys demolishing the Earth trying to kill each other above. Did we mention that now both Superboys have telekinesis, because apparently not even Superman’s relatives are safe from randomly getting powers that don’t fit their character. Hopefully Convergence can help sort some of this mess out, but judging by the way the current Teen Titans title has been going, the odds are grim.