And, though I'm likely to get my ass kicked by the Green Arrow fans for canon issues, I really wouldn't be surprised if the kid is Conner Hawke. They've messed around with canon for Chloe often enough that it's kinda a given. And I'm okay with that.
Although the Aunt Chloe with baby Christopher, whose hair is canon light-colored, wouldn't upset me either. And I've heard a theory that I really like regarding it.
Putting on rose-colored glasses and riding out. A lot can happen in two hours' worth of finale.