The two-part season opener has The Doctor, Amy and Rory on an adventure over here in the US, where they “find themselves on a secret summons that takes them on an adventure from the desert in Utah-right to the Oval Office in 1969” Also the two-part has as few guest stars in the form of Mark Sheppard who is playing Canton Everett Delaware III per IMDB, and of course Alex Kingston bring back River Song.
EW also says that the show had record ratings for BBC America and was at top seller on iTunes behind Mad Men and Glee. (I am one of those people, as I only jumped on Doctor Who after the last season aired, mostly thanks to the Nerdist)
Also, check out their first look at the new Doctor Who poster, can’t wait to see a larger version of that!!