The public spending watchdog will publish a report early next year after being called in by the Accounts Commission and Robert Black, the auditorgeneral for Scotland.
"It is expected to be an interim report that will consider the progress of the project, governance arrangements and the key issues that will need to be managed as the project goes forward," an Audit Scotland spokeswoman said.
Project chairman David Mackay resigned earlier this month. Edinburgh City Council is expected to meet to discuss how to progress the scheme next month.
