I would be happy if that was to happen.. but, PR is only a rank of how good your content and incoming links are...
That's an interesting idea. However I doubt it very much. It's going to be just a waste of computer cycles. But who knows, they have enough server power.
What is Toolbar PR good for besides those who sell links? Obviously average user does not at all care about it. So what would they lose if they hadn't shown it at all, they hate link sales anyway and it will only do harm to those who sell links.
It's not that important to everyone but its a way to measure a sites popularity assuming links haven't been bought. I have a feeling it will be after Easter.. that could explain the N/A for February in the Webmaster Tools. Does anybody have something else showing under February?
I think it's pretty well established by the experts that the data is constantly updated but just not made available for us to see. What might be changing is the rate at which they make this data public. Others seem to think the updates themselves are more frequent.