I would pretty much bet my left arm that Parker won't get with Eliot in a romantic sense. On almost ever DVD Commentary the Producers and Writers talk about them as a brother/sister like pairing. At first I was annoyed by that. But now I'm okay with it. I can see what they mean. And as long as they are close and protective of each other and share scenes... I'm happy.
Leverage isn't about the romance. It's about the group being a family and caring about each other. Romance is sometimes mixed in, but it isn't the focal point.