The dates below show updates conducted by Google over the last 6 years. As you can see, for more than 18 months Google has been publishing a general update of Pagerank only every three months and the last eight months have passed without any updates.
There has been great speculations about what caused the delay but there isn’t an official reason for Google being behind schedule. It could be that the last major update of Pengüin algorithm affected the PageRank algorithm or even, as some people think, Google could be in the process of abandoning PageRank.
Whatever the reason, this makes PageRank an unreliable and unfair way of calculating the value of your links, so we have decided to use mozRank as our primary metric in calculating Link Credit. As you know, Mozrank is expressed to 2 decimal places so for simplicity we will strip the decimal value when recording the mozRank for a page. For example, a mozRank of 3.67 will be recorded as 3 for the purpose of link credit calculations.
At the moment, all link credit is still being calculated using PageRank, but about
November 15th we will start the transition to using only mozRank. From that date the value of a link will be calculated based half on the PageRank and half on the mozRank of the page. We expect to complete the move from PageRank to mozRank on December 1st when Link Credit will start being calculated solely by mozRank (rounded down).
Moving to Mozrank has been delayed. We will send a newsletter, show a message in your Automatic Backlinks’ dashboard, send a tweet and write a blog post here before making the changes. Thanks for your patience.