For SOAP, I can see the marketoGUID field.
For REST, looks like it is yet to be done.
Steven Vanderberg could you please let us know if this is going to be available for REST api as well? If so, what are the timelines for it? Will there be a new api version for the REST api for this change?
Do you have any information for SOAP API related changes: DescribeMObject SOAP API does NOT return "MarketoGUID"?