The timeframes are subject to change. In my experience, unless something major comes up, it's pretty spot on.
I am probably one of the few people in Australia looking forward to the NBN coming to my street. I have Optus 100mbps down, 1.2mbps up. I have been asking for years for a better upload speed.
I can’t wait for Optus to ring me and ask if I would like to switch my Optus service to Optus NBN so I can stick it to them.