Since the last Google PageRank update was done on New Years Eve of 2010. The next PageRank update will be scheduled by Google somewhere between the March-April period, as every update generally is displayed for public viewing every 4 months, it is very probable that it will be in April.
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.
In reality, there is a private value of PR only visible to Google that changes everyday.
Good luck to everybody !!!
Post author: Daniel Semper