Telstra plans to roll out its LTE network fast and is said to maintain this speed into 2012. Over the next year or so, more and more traffic will flow onto the LTE, especially into 2013 when the digital dividend 700MHz spectrum is made available. Speed-leader Telstra wants to soak itself in the LTE-goodness, and are vowing to make the transition as seamless as possible. So instead of marketing LTE as a separate service, it will issue one with the same 3G/4G dongles so that the 3G and 4G networks work seamlessly.
Most users won't be aware of which network they're using. LTE will also be more expensive, but only $10 more per month. So the extra speed is not too much of a jump in the wrong direction.