You can tell what version of the VE is installed by using the Help menu >> Troubleshooting dialog, click the Install History button and the version number is displayed with a description of the version you are running.
The most accurate way is to look at the Internal Version number, this is in the format:
<major version> . <major update version> . <minor update version> . <hotfix version>
VE 2012 Feature pack 1 is 2012.0.1.0
VE 2012 Fetaure Pack 2 is 2012.0.2.0
VE 2012 Feature pack 2 Hotfix 1 is 2012.0.2.1