well my normal is 6.39Mbps down and 0.88Mbps up.
the NBN for the fibre to the node is suppose to guarantee max 25mbps down and 5mbps up on copper. the fibre direct connection is up to 100mbps download. the standard plans 12mbps are less than what you are getting now.
The good news is that you no longer have a choice as you are now officially in the first 18 months of having to move over - after that they can shut of the ADSL so like it or not you will be forced to move over to the NBN. I have been dealing with the NBN rollout in my local area for the past 5 years
with the rollout in Newcastle the only direct fibre is in new subdivisions or in mayfield. the rest of the area is FTTN. now for those flush with cash you can at some considerable cost get fibre to your home from the green box to get 100MBPS (average cost was over $8k extra installation costs) so like shane said if you have a green box out the front you could save a bit
.