Via Outpost Gallifrey, Series Two of the new Doctor Who series will probably see its US debut on September 29 on the Sci Fi Channel. It's not official from SciFi yet but gathered via an NBC/Universal press release.
Even better is that SciFi will be showing Doctor Who at 9pm and and Battlestar Galactica season 3 at 10pm on the same day. Friday nights sorted (if you get the US SciFi Channel).