Yarra Trams will be carrying out a major upgrade to the Clarendon Street junction light rail stop over the next few weeks which will mean that there will be no 109 trams servicing Beacon Cove (or other parts of Port Melbourne) between Sunday 3 January to Friday 15 January.
During this work, replacement buses will operate to the normal frequency. These buses will not travel through the Southbank/Casino/Flinders Street area and will terminate on Collins Street opposite Southern Cross (Spencer Street) station so you will need to change to a tram to get further up Collins Street or walk quite a long way if you want to go to the Casino or Southbank. They will also take considerably longer than the light rail so allow plenty of extra time if you want to get into or out of the city on public transport.
Yesterday there were some brochures with comprehensive details of the work and service changes at the Beacon Cove light rail stop. There is also some information available here.
Sorry for the late notice - I only found this out yesterday when travelling on the tram.