while installing Mustang, the InstallShield window shows the version as Version 6.0
However, when the License agreement comes up, it says Version 6 as shown below :

Pre-Release
Software Evaluation Agreement

SUN MICROSYSTEMS, INC. ("SUN") IS WILLING TO LICENSE THE JAVA SE RUNTIME ENVIRONMENT (JRE), VERSION 6, PRE-RELEASE SOFTWARE TO LICENSEE ONLY UPON THE CONDITION THAT LICENSEE ACCEPTS
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ALL OF THE TERMS CONTAINED IN THIS LICENSE AGREEMENT ("AGREEMENT")............


The version string should be same everywhere.
The reported problem is visible with Mustang beta builds, the rc builds don't have this issue