Notice in the first picture two very interesting things - one that Amy is fleeing from the FBI and two, that she's got some interesting marks on her arms not that dissimilar to the ones that River had been branding on hers for earlier shots of this story. According to Piers Wenger, this story is going to be something of a love letter to America and while the filming was in place in Utah, expect scenes in New York, San Francisco and Washington as well.
This season has also had a few more details revealed in other areas too. Neil Gaiman's character Idris in the third episode is at the end of her life but doesn't die, Mark Gatiss's story is suburbia based, episodes 5 and 6 will be a two parter by Matthew Graham and are rumoured to be titled The Rebel Flesh and Gangers, featuring Sarah Smart (At Home With The Braithwaites) while Steven Moffat will scribe episodes 7 and 8 with a break in between them as the second half of the season will air in Autumn 2011.
The Doctor, Rory and River in a particular scene together and it's nice to see that if Amy's wearing plaid, then Rory's wearing some shorts as exchange. I guess with the FBI look, River might be working for Canton (Mark Shephard) and his cronies again. Other casting for this two parter includes Dtuart Milligan, Marnix van den Broeke, Chuk Iwuji, Mark Griffin, Kerry Shale, Glenn Wrage, Jeff Mash, Sydney Wade, Tommy Campbell, Peter Banks, Nancy Baldwin, Kieran O'Connor, Alex Giannini, Adam Napier, Henrietta Clemett, Paul Critoph, Ricky Fearon and Emilio Aquino, according to DWM.