Finally status in immi changed for me, it is showing as granted. However, I haven't received my visa grant letter from MA yet, she is on leave currently and would return tomorrow, well another day of wait.
Visa Applied:12-Dec-2014
Granted:4-02-2015
Just to add I thought of travelling back from Australia on Bridging B visa, today morning 9:00 am I queued up to submit my bridging B visa form at department of immigration and when I returned home at 10:30, I got a mail that visa has been granted, then I rushed again to department of immigration to withdraw bridging B visa form, else it would have costed $150 more for processing charges.