I prefer the Robin/Artemis pairing. Here's how I think it will happen: somehow Artemis' secret will come out and the others will be wary of her. But Robin, having his own secrets, will trust her. They will get together, despite what the team thinks! XD
I think Wally will feel little betrayed at first when he finds out about her dark past, but he will see why she had to do everything she did and admire her even more. I think the writers have set up a really interesting romance between the two.