UPDATE:

When I got my replacement disc back a few weeks ago, I made up for lost time that I wasn't playing by trying to cram in all the Heists at once. Yeah, I finished them all a while back but the thing is, I'm still replaying as many as I can because each Heist has different jobs. So, you get to see and play it from a different point of view which keeps things interesting. I love it. Rumor has it there are suppose to be 3 new Heist in the future. I would love to see those, but I'm not holding my breath. I think it's just more fan-talk of wanting more then something that is actually coming to us.