The body will probably be cremated. End of story.
I would be surprised if he is cremated. When Scalia was younger, cremation was prohibited by the Roman Catholic Church. That policy changed sometime after Vatican II but tradition-minded Catholics of whom Scalia was one tend to stick with the old ways. Additionally, one of his sons is a traditionalist priest of FSSP and will probably preside at the funeral Mass and would be none too pleased with cremation of his dad.