What are the chances of there being a Season 4?

I just discovered this show on Netflix and bingewatched the first two seasons and watched season three on youtube. I absolutely love the show. The plot lines are fairly predictable and there are plot holes every now and then, but the characters are fantastic and the chemistry between Phryne and Jack is sizzling.

What are the chances that there will be a season four? I mainly worry because the first two seasons had 13 episodes and now the third only has 8. Also, I found that it is broadcasted on Friday nights in Australia, which is a horrible timeslot in the states. How are the numbers for the show when compared to an Australian audience? I saw that most episodes get a viewership of a little less than a million and that would be a death sentence for an American audience on a basic cable network, but that may be great for Australian television due to a smaller population.

Crossing my fingers that there will be a fourth season. I need more Phryne and Jack!