Its time now, Google updater is coming soon, but you have to do one thing if you want to update PR of your site that is more and more links, at this time there are about 150 links for site shown in your signature and almost all of them are from 2 sites, work on them.
Page rank updates four times a year. I suggest instead of focusing on page rank you should consider traffic. It will indirectly help to increase page rank as well as sell.
Some website already got updated, they call it a minor update. The major update will be done on the beginning of October. But let see, I hope my site got a PR at least.