Last night we released an update to ArcGIS Pro Prerelease. To get the update you'll need to have Pre-Release installed and authorized. Then you start up Prerelease and will be notified that an update is available. Actually there are 3 new updates, one for the app, one for the Help System and one for Python.
With this update, ArcGIS Pro is "feature complete" for the 1.0 release that will be part of ArcGIS 10.3 for Desktop. Our focus has shifted from new development to bug fix and stabilization. More than ever we need your help. If you see something wrong please say something. You can contact Support and or submit a error report.
We have also added a new Category to the ArcGIS Ideas site called "ArcGIS Pro". This is were you can submit ideas to improve the app and vote on other user submitted ideas.
Thanks for all your patience and help with this release!