Wai Chu Technical Product Manager for Revit Structure has posted a thread on the AUGI Forum that the Autodesk Revit Structure product team has just uploaded some new structural .rfa content in the Subscription Center.
New content includes some AISC 13th Editions steel sections, Joist Girders, many UK Metric families and Finland ones, etc.
Once log into the Subscription Center, scroll down to "Product Information & Downloads" section and click on "Building Solutions: Product Modules & Add-Ons". Under "Structural Engineering Solutions" click on "Subscription Structural Library"
They are asking for users to try the new rfa's give them some feedback..