And Top Gear premiers on the same day as the Super Bowl here. Bad timing, BBC!
That's why it's premiering on BBC America a week after. I don't think they'll be too worried about some people watching the Superbowl instead of pirating their show.
I am slightly surprised it is not broadcast on BBC America the immediate Monday after the Sunday UK showing since they at least jokingly note it is their most-pirated show. BBC America gets new Doctor Who episodes the same day as the UK, after all.
That's why it's premiering on BBC America a week after.
It probably takes time to re-edit the show to replace music, etc.