The Next PageRank Update?

When will the next google update take place? A question that is bothering a lot of webmasters (at least me hehe). I just started with serious web development and I really like it so far. A lot of people are saying that the next update will take place in end January. I read about it on many forums. I hope they are right.

According to this tool from my website will go from pagerank 3 to pagerank 4, and my blog will go from pagerank 0 to pagerank 3. I hope they are right on these predictions.