A WebmasterWorld thread from early May is showing a PR5 on some datacenters, so it does look like a legitimate update is spreading slowly across datacenters.
It’s sad that anyone even cares about PR anymore. We have PR scores showing zero on pages that are ranking top 10 for competitive gambling terms. That should tell you how important PR really is. There are much better metrics out there for determining a websites quality, but I guess PR is the quick and dirty way to go.