I certainly hope the federal partial-birth abortion ban is not upheld, but after that constitutional atrocity known as Raich, who knows?
As matters currently stand, only one conservative--Justice Thomas--will likely vote against the federal partial-birth abortion ban on commerce clause grounds. The two other principled defenders of federalism, Rehnquist and O'Connor, will have already left. Scalia is only a fair-weather federalist, and I suspect that Roberts, Alito, and Kennedy would all vote to uphold the ban.