From 11/12/2014 the Migration Act was amended by the Migration Amendment (Character and General Visa Cancellation) Act 2014. There are many changes regarding provisions for character requirements, visa cancellations and related issues. More details can be found here: http://www.aph.gov.au/Parliamentary_Business/Bills_Legislation/Bills_Search_Results/Result?bId=r5345 .
I think the character test definition change that applies to visa refusals/cancellations is the most interesting change. Character test is defined in the Migration Act s.501(6) if someone wants to see the exact wording. For example, a person does not pass the character test if the person has a substantial criminal record (defined in s.501(7)). And the person has the substantial criminal record if the person has been sentenced eg. to 2 or more terms of imprisonment, where the total of those terms is 12 months or more. Before the legislation change, it was 2 years or more. The
In addition, there is a new provision for a mandatory visa cancellation (s.501(3A)) in cases where, for example, the person has been sentenced to a term of imprisonment of 12 months or more and the person is serving a sentence of imprisonment, on a full‑time basis in a custodial institution, for an offence against a law of the Commonwealth, a State or a Territory. This might be crucial for some permanent residents who will no longer have a chance to explain why their visa shouldn't be cancelled if they have failed the specified provisions of the character test.