Since Google changed the URL and PR flow within Google Plus, there has been lots of rumor on how Google must have killed PR and started from his own property. Moving forward, many assumed AuthorRank is replacing PageRank already!
Here's a huge long discussion on this that adds some common sense:
"If such a change did take place, wouldn't it result in a corresponding shift in how pages are ranked and ordered on a logged off Google, and cause pages that aren't associated with a particular Google plus accounts to diminish in rankings, especially pages that are scrapping content?"
What's the Toolbar PageRank of your Google Plus profile?