It is scheduled to start in the Spring of 2010, but an exact release date hasn't been announced yet.
Yes, next series.
River song and the new daleks.
Go on the Doctor Who website. It's [See Related Links]
They don't do open auditions.
Yes.
There will be a Christmas special this year on 25th December, but the next series will be Spring 2011, and will be known as Series Six.
The Next series of Doctor Who will be shown in 2010. Most likely starting on BBC1 in the spring, although this is not confirmed. For now we have to make do with the 2009 specials.
The 2010 series started months ago, on the 3rd of April for the UK and 17th April for the USA.
No, Mat Smith is doing another series next year.
No, it's just the end of series 5, there's another series next year.
The final episode of series 4 is called Journey's End.
It is 'A Good Man Goes To War', the episode before the mid-series split:)