If you have not yet installed Apple's Java Mac OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. There is an important difference about the installation of Oracle Java (both JRE and JDK) that you should be aware of.
The Applications -> Utilities -> Java Preferences application is part of Apple's implementation of Java. Once Apple no longer distributes Java as part of their release, the Java Preferences application is retired.
Under Apple's implementation of Java, it was possible to have multiple JREs installed, and the Java Preferences app was used to determine the first compatible version that would be used. The following instructions show how to change the default JRE.