From the Article:
Vodafone is offering new customers switching to the network a free months worth of access – and two months worth of unlimited data as well.
The offer is open to anyone porting in their existing number to Vodafone and signing up to any post-paid voice or mobile broadband plan. The offer is open from tomorrow, the 23rd of March until next Tuesday the 29th of March.
Unfortunately I can't find a web link on the Vodafone website, it may be something you need to ring up to get.
Will they do anything about the payout fee I would have to pay Telstra?