I have been an ADSL2 customer for the past 5 years, userid is 5293262, and have called to move to the NBN because it is about to be connected in my area. The NBN was supposed to be connected on the 28 of February, but it looks to be delayed.
For existing TPG customers, there are few ways to switch over to the NBN service:
Here's a guide on Choosing the best TPG NBN Plan for you.
Once you've successfully switched and modified your service, you can check the progress of the installation HERE.
Note: For further information on NBN scheduled roll out, you can check: http://www.nbnco.com.au/learn-about-the-nbn/rollout-map.html