Based on what we're told in Hot Pursuit, I'm guessing Eden is Izzy's HEA. Without giving away too many spoilers, I'll just say that there's someone in the book interested in Izzy, but he remains faithful to Eden. One of his reasons is the new person "doesn't get his jokes", which if I remember correctly was one of Brockmann's reasons why she never thought Izzy and Tracy would work.
But who knows, before Dark of Night I would've sworn Deck and Sophia were going to end up together, so it wouldn't be the first time I've been wrong.
Izzy is headed back to Germany to see Eden again at end of book. This Maria chick offers him a deal where he could be her husband so that he could take care of their children and she could go on and pursue her political career. Soooo not going to happen.
I can hardly wait for the Izzy and Eden's HEA story. I want them to stay together. Granted Eden is so messed up and Izzy got a lot more than he bargained for. He does seems to really love her unlike the Mary Lou and Sam relationship. But Suz hasn't broken up a married couple( who are the love of each others lives, or might be) in the series yet, so i hope she doesn't start with them. Eden definitely needs to grow up some more and learn to trust Izzy.
It's so hard to predict. One of the reasons I love Brockmann is because she continually surprises the reader in ways I haven't encountered in romantic fiction. I would never have predicted Deck and Tracy and even though Brockmann retconned a bit in order to create flesh out their relationship around the office, it was still a very well executed surprised. When Izzy was propositioned in Hot Pursuit, I honestly had no idea what was going to happen. I agree with previous posts that Eden really does need to mature a bit. I mean, she was like barely 18 when the two sorta hooked up, which felt a bit creepy to me at the time.