I've just finished S1 & 2 on Netflix so despite being left quite confused and frustrated by the loose ends and endless 'coincidences', like all good addictions I'm in for another go
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I'll have to watch on catch up though as I don't have broadcast TV.
You are corret re: the end of S2. She was under the bridge when the 'spook' type cop (I think) came along and told her she was dead and would she like to join him and Laura undercover.
I found and read the old Telly Addicts threads and someone rightly pointed out just how undercover could she be with a Joker style slash up one side of her face 
So as it's fresh in my mind..
Do we think she killed Juliet or was it Edward? (probably not on purpose if he did. I think he knew his Mum was stressed and tried to comfort the baby and dropped her)
Just how much of a total dickhead will Jason be this time? Or maybe they all jetted off to Singapore as planned. I hope to God someone got some serious counselling for poor Edward. How much can one little boy have happen to him?
Will we see the lovely Rav?
I really went off previous eye candy Tim in S2 but I guess he could redeem himself if he was to appear. I don't think we were shown the outcome of his embezzlement arrest so maybe not.
I hope we find out that paedo Dawkins has been killed in prison while awaiting trial for what he did to Edward.
Did Adam (the little boy that escaped) wake from his coma?
And probably a thousand and one other questions we need answers to. Feel free to add your own 