In fact, no longer is Google showing the PageRank score in the marketing image used on the Toolbar page. Plus, it seems like Google is making it harder for users to turn on the PageRank indicator within the toolbar itself.
Does this surprise anyone? Well, we know a few things. We know Matt Cutts of Google, a very influential person at Google, has wanted Google to remove PageRank from the toolbar for a while now. We know Adam Lasnik of Google followed up on that, and asked for feedback on removing PageRank from the toolbar. We also know, many SEOs want the toolbar PageRank to go away. So it comes to no surprise that Google is slowly 'hiding' it from the average user.
The WebmasterWorld cites legal issues with having the PageRank score in the toolbar. I won't get into that point.
Forum discussion at WebmasterWorld.