I am not going to lie the first thing I thought about was bringing dinosaurs back.
Ok, now in all seriousness ,the future possibilities are endless and I believe that in the not too distant future, that we will be so entwined with technology that up and downloading our memories and consciousness into a database will be possible. Cloning is already done so the organic part is there.
However, now you have to think about the ethics of bringing back someone that didn't want to be here in the first place.
Very thought provoking.