I couldn't use it also, and after checking the code I don't get it at all.
If you try to map an existing people picker, to SPFindPeoplePicker, I would expect to do something like:
var $ppCtrl = $("#idOfPeoplePickerControl").SPFindPeoplePicker();
then I would get his current value using
$ppCtrl.currentValue;
However, this approach didn't work and after checking the code I couldn't get how it would ever work. I found a $("nobr") on the constructor, which I don't get what he is trying to match, since there are no <nobr> in the page. So clearly I am not using this method the right way. Could someone clarify this problem?