This week will the last week forever that the Western Concourse between old Platform 1 and Roe Street will be accessible. That along with Platform 8 will be closed from 3am Sunday Morning. Armadale C# and Fremantle line services will finally resume from the normal platforms (Fremantle back to Platform 7 and Armadale C# back to Platform 6 (i.e. moved back to where it was). This is part of the new Citylink project.
More info here:
http://www.transperth.wa.gov.au/Service ... fault.aspx