I have not heard about any plans to do this on SOAR standalone, but it's possible something like this could happen with Cloud Pak for Security.
Other cloud paks offer a free trial and there is work ongoing for something similar in security. There is also an internal programme starting soon where temporary Cloud Pak instances are available to IBMers for educational purposes. I don't have much more information on it, but I have asked if this might become available to end users as well, i'll follow up if I hear any response.
------------------------------
Sean Mc Cann
------------------------------