Thats not really a rumor, for the last couple of years Google has made PR updates approx.. 4 times per year. Usually every 3 months or so. BUT you are right, no one really kmows with Google.
No one actually knows the exact date of updating Page Rank.You just keep doing your work The Best Way and will get higher page rank when Google will update page rank.You just not to worry about it.
Nobody is gives you exact date of google page rank update, I am doubtful that even larry page could know that...
PR has no time limits and has no specific span for each data center. Sometimes i observed having PR crawled within two months, but in 2008 it took around 2 PR crawls in whole year.
the last major update was april 2010, but my other website got updated july 1st. Google does minor updates all the time and only major updates quarterly. We are due for one major update very soon! I am hoping this month! and yes with google you never know!
google page rank updation is done on quarterly bases.... the page rank calculation is done by various formula for more kind of information try the wikipedia.org/Page_rank
I listen that Google regularly update the PR for every 3 months but its depend on good quality back-links.
I m totally agreed with Michael the google is not updating page rank as it was happening back in 2009 .
Some minor updates are happened in September. one of my site went to PR4 from PR3 last month.. But no idea about the next update.
Google updates PR usually after 3 months, however it also depends on your sites progress. Google page rank algorithmn is used to calculate PR. It's the combination of both onpage and offpage seo.
It should be more than 3 months. My website has been on PR 1 for over a year now despite my back link building
Page Rank Update is very unpredictable now. It's more than six months ago since their last PR Update.
Google must update PR within this end of the year to make sure the future life of those who are completely depends on it like me!!