When news of the plan first broke, in June Telstra had yet to announce that, subject to shareholder approval it had finalised its definitive agreement with NBN Co and the project was seen as a move by Telstra to strengthen its negotiating position.
Telstra says it is now finalising the locations of the first 900 of a planned 2000 Top Hat installations but "Locations where NBN rollout is imminent or on the roadmap for the near future will not be getting Top Hat technology. It is an interim technology to provide fast broadband pending NBN rollout."
Details of the first 970 locations to get aTop Hat upgrade can be found here. The material is not in a particularly user-friendly format but detailed maps of each area can be downloaded.
Telstra is also upgrading backhaul from the street side cabinets to gigabit ethernet to remove potential bottlenecks in the network. This work will take place over the next 18 months.