An update ...
My contact in the Velocity Team at Telstra rang me today and said that there might be some good news in the pipeline (no pun intended!)
The network planning team got back to him and stated that they would not be putting copper into the estate. Apparently they are aware of the estate and it's "probably not feasible to lay any copper in this area".
Whilst this isn't confirmation that they will come and lay fibre it's the first good piece of news. I have a number to ring tomorrow to speak with someone and I'm hoping they will have more concrete information about what will be installed here in Sarah Lands.
Again, my contact didn't say it was fibre just that the team at Telstra "probably" wouldn't install copper as there is no other copper in the area hence not a feasible option.
Will keep you updated in the next couple of days. This might confirm the report we had that the estate would be NBN in April.
Can't happen soon enough!