There's enough unexplored for a season 3 story-wise.

I heard they will make a US version. If it's like Shameless US, I'm all for it, but usually US remakes tend to make a bad copy that also stretches out for no reason. I really like the British and Australian format of a few dense episodes rather than 12 or 22 US episodes where it's 60% filler material. However, if it isn't story driven, then making 22 episodes is ok.

After the bad US copy of Rake tanked, the Australian original got a 3rd season, and it's likely to get a 4th one, so sometimes studio heads make sound decisions.