Pushing wireless internet to faster and is probably a master move from Telstra. Increasing the speed of wireless seems to make it more and more attractive to the user (obviously there are the limits per tower). However the big strategy seems to me to be that a wireless network has high latency making VOIP next to useless. This means that it is fine for browsing, but Telstra maintains its stranglehold on the public which would need to keep their landlines.
Obviously this is great for Telstra shareholders, which the board of Telstra reports to at the end of the day, but useless for customers. Just one more reason why structural separation is probably the only way to go.
I have particular experience of this trying to use Skype video conference with someone using a wireless dongle in the UK. Both systems report 8MB down, but there is a huge issue with dropped packets on their end.