VoiceAttackHelp.pdf is updated and included with the installer or the zipped version. It's not updated on the website with each beta release, as not all users install that.
There should be a "VoiceAttack Documentation" shortcut in your start menu that'll take you right to it(though you can navigate to your VoiceAttack installation documentary manually and find it in there as well).
Note that there are section on the new tokens, and the new "For" loop, so you can tell by those it's current.
There's also a version number next to the title of the first section(which would be the next release version number and isn't changed for each beta release): "VoiceAttack Quick Start Guide (v1.6.5+)"
Gary, do note that the VoiceAttackHelp.pdf available through the main page's "Help Documentation" link is for "v1.6+", not "v1.6.2+" as the one for the current release is labeled.