Seems to be afew people around in different places, that ask how to find out about when cabinets are being upgraded etc, So thought I'd be helpful and provide this.
Use this tool to find the Cabinet name: Telecom Wholesale Cabinet tool
Type in your address and it will display some information about your exchange and cabinet. If it hasn't already been upgraded, grab the Cabinet name.
Goto the Chorus Website Cabinet Notice page
Download and open the file named: Cabinet Migration Schedule its a Excel file so you will need excel or similar software, can't remember if there is a Excel Viewer available or not from Microsoft.
Once open, find your cabinet name, on that line it will have the name of the exchange, Area affected, Cabinet migration date(Approx) and/or whether it has been already upgraded or not.
This will provide you with basic information about when it is migrating to ADSL2+ etc.
Hope this helps.