I want to believe that this will not suck.
…but I have a question. If you have time travel (OK), and you’re using it to dump bodies (…OK), why are you sending them back to a cornfield for some other guy to shoot them? Open up the portal in 10,000 BC, 20,000 feet above the Marianas Trench – and heck, that’s being artistic: anywhere out in the ocean will do, really.
I’m not saying that the movie won’t work, but if they don’t nail down the ground rules about why you can’t do that – and stick to them – then the movie is going to suck. Even if it does have Bruce Willis in it.