Collider wrote...
I have a question. What do you want to see in ME3 in terms of Jack?
A cameo. An e-mail, at the most.
Now that that's out of the way, to answer your question, we would really need to know the format of the game.
If it's a Landsmeet thing, like in DA:O, I don't know if Jack would actually contribute anything to the story. In that scenario, it seems to me that any character hanging around with Shepard would need to contribute something to raising awareness about the Reapers, and finding a way to stop them. If there's a deus ex machina thing, does it really matter who's on the squad?
If ME3 is all about a deus ex machina, like I said, does it really matter who's on the squad? It could be everyone, crammed in to every possible space they can find aboard the Normandy, or it could be an entirely new squad, or it could just be Shepard and Joker, cruising around. Of course, in this situation, I'd love to have Jack around.
If Jack is around, I'd love to see more of her backstory explored. Her parents (if she has any, or if she was grown in a lab), her life as a young criminal, scavenging to stay alive, then her life as a professional criminal, maybe finding out more about Murtock. It'd just be a matter of if the content can be fit in to the material Bioware can possibly fit on a game disc, while still wrapping up the plot of the whole series.
If Shepard romanced her, then we could see her feeling much more relaxed and casual around him. And, of course, the Super Happy ending.