Immigration law, student visa, employment visa, partner visa
Normally they would sent an email (which is a common practice) . Nevertheless, it can be understood that as soon as you lodge a new visa application and DIAC acknowledges then you are eligible for Bridging visa grant, provided you have lodged your new application before your previous visa expires.
VEVO would help you in finding this sort of information in some cases. BTW have you had a chance to check yours yet?
Please check the extract from form 1024. You can see the full form on DIAC's website.