The PerformancePoint Server forums are now part of the official TechNet Forums and no longer limited to Microsoft Connect Beta Forums.
For those that didn't see the relatively active Beta forums on Connect, Microsoft separated the product into two groups and this is reflected in the official versions too.
Monitoring and Analytics:
At the time of writing the Planning forum was empty and the M&A forum had just the single topic. It will be interesting to see how the activity picks up through the launch period and into the New Year.