Heartless (Pretty Little Liars Series #7) Book

OH MY GOD. This changed everything I thought I knew about the series and we were left with another cliffhanger again. Wow. So the next book is supposed to be the last and now I'm wondering if I'm ready for this. 7 books and I can't seem to get enough. There was more suspense than usual in Heartless and the plot twists seemed much more important.
Okay so spoiler time!
1) Darren Wilden the cop is from an Amish settlement that A sent Emily to and God knows what happened to his ex?girlfriend Leah. Could she be the body that was found in the hole? DNA results are not back yet, unfortunately.
2) Jason DiLaurentis says Aria doesn't understand why he went to Radley. I think theres more to this in the next book. Maybe he was visiting someone?
3) Okay, so the mental hospital that A sent Hanna to was in the evidence file that A sent Emily to find.
4) Could this be where she meant Iris? Is Iris going to appear in the next book? She seems to know way too much about Ali and Ali warned Hanna in her dream.
4) What is up with Ian Thomas? Is he dead? Are we ever going to see him again? He definetly wasn't the one IMing Spencer since apparently it was the creepy outsider arrested for Ali AND Jenna's murders. I doubt he did it though. Aria still has his class ring and I don't think Melissa is in contact with him.This isn't looking good, Ian, we need you now more than ever.
5) NEWSFLASH! Jenna's dead. Why? Who knows.Its sad because she finally made a friend after watching everone painfully, Emily's exgirlfriend, Maya. Apparently the pedophile got her, and disposed of her body like Ali. I guess we'll never know about Jason and Ali's sibling problems and the whole mystery of Jenna herself. RIP Jenna Cavanaugh, your character will be missed greatly.
6)I don't know where to start on this one.Ali's mom and Spencer's dad (Yes her parents are her biological parent's but Olivia delivered her) were an item! Even more suprising Ali, Spencer and Melissa are sisters. Maybe thats why Ian had a thing for all of them. Oh, and Jason might be part of this happy family too since Spencer's dad said kidS.
7) While on the topic of romance, here are the following couples: Spencer and Andrew, Aria and Noel, Hanna and Mike and Emily is flying solo. Three cheers for younger lacrosse boys and love!
8) The girls are starting to talk more. Maybe this will lead to a renewed sense of sisterhood (Am I the only who thinks the 'Pretty Little Liars' would be a fly clique at Rosewood?). At least they would be better than Kate, Naomi and Riley. Bleh!
9) As for Melissa she seems to be living her life Ian-free but traumatized.
So now whats to happen to our 'Pretty Little Liars'? Got any theories?