After several days of rumors and claims on the internet,
Sci Fi Channel has publicly announced that Doctor Who Series 4 and The Sarah Jane Adventures Series 1 will begin airing in April 2008.
The official press release can be read by
CLICKING HERE.
Air dates and times have not been revealed yet. This will mean that Doctor Who airs in the US within a few weeks of the UK airdates, and that the Sarah Jane Adventures will actually air in the US.
Thanks to Benjamin Elliott at This Week in Doctor Who.