Hi Laura,
I see that it is a demand to support step files in Revit as well. In Revit Ideastation I have found similar requests from Revit community as well: https://forums.autodesk.com/t5/forums/searchpage/tab/message?filter=location&q=step%20files&noSynony...
If you agree with them, please support them by a vote.
As far es exact details are concerned about when this will be implemented, I am afraid I cannot give you information, but it worth to follow those ideas / communication in Revit Ideastation for eventual further information.

Orsolya Balazs
Product Support Analyst - AEC
Autodesk, Inc.