Today (Wednesday, 11-FEB-2009) I upgraded apex.oracle.com to Application Express 3.2.0.00.21. As our long time customers know, this is one of the last milestones in our cycle prior to production release.
You can go here for a brief introduction to the new features in Application Express 3.2. As you'll see, there are two primary themes - Forms Conversion and security. The Application Express 3.2 documentation is not staged yet, but the online help/documentation is current for APEX 3.2.
If you encounter odd behavior or you feel that something was not properly upgraded in your application, please feel free to report it on the APEX OTN discussion forum. We will watch this closely.
Thank you for all of your support.