Joel,
Currently we have no knowledge that could be provided on this. It appears you are the first to ask about OLEDB.
So the answer would be: Process Automation reaches through a JDBC driver supplied by your Database vendor to reach into back end databases. If you can add a JDBC driver that allows access to your OLEDB, which some general googling indicates is possible, then it is possible it will work without problems in Processes.
This would be a good enhancement for a future release if you want to hop over to the IDEA area and post this requirement.