Anyone know about this new payload? Seems there is very little info out there
"You can now configure the System Migration payload on computers and customize the source and target path pairs when data is transferred to a computer using Apple's Migration Assistant. You can migrate data from both Mac and Windows (Windows XP or later) computers. The target folder is created if not present. For more information about moving data from a Windows PC to a Mac computer, see the following article from Apple's support website:
Move your data from a Windows PC to your Mac"