Apple implemented few days ago a Java security update 2012-001, due to the Trojan BackDoor.Flashback that infested more than 550K Mac, mostly in the U.S., Canada and UK.
According to the reports received by 9to5 Mac, it seems that Apple is pushing forward a new version of Java update, as noted in the Software Update. The new update, 2012-002, displaces the previous –001, though it appears in the KB article still as -001.
Specifications about the aim of the new update are not mentioned yet. Maybe the first update was meant to close the vulnerability in Java 1.6.0_29 that caused the Macs infection, while the latter comes with security improvements.