Telstra I don't believe have announced it as yet but all that is required is a Power Cycle (reboot) of your cable modem to update to the new configuration files
Cable (Base Plans)
Down: Will change from 36Mbps to 55Mbps
Up: Will change from 1Mbps to 5Mbsps
Cable (With Speed Boost)
Down: Will remain the same
Up: Will change from 2Mbps to 5Mbps
Speed above are approximated/average.
You can test your speed here
Enjoy
@Wibbleman:
Tested it twice. Got 101.9 Mbps and 101.4 Mbps - not 115.