Since the last Google PageRank update was done June 27th, 2011. The next PageRank update will be scheduled by Google somewhere around the last week of August 2011 or in October. Lets remember that every update generally is displayed for public viewing every 4 months, therefore it is very probable that it will be in October.
There are no rules about this, if Google wants to update the public value of PageRank every 1 or 6 months, it is just up to them.
Pagerank have a range from 0-10. A site with PR 0 is least important and the site with PR 10 is the most important in the eye of Google.
In reality, there is a private value of PR only visible to Google that changes everyday.
Good luck to everybody !!!
Post author: Daniel Semper