It is now set to be released on Monday October 4th 2010.
In a news post, Silva Screen said:
Silva Screen Records informs Doctor Who fans that Doctor Who: Series 4 – The Specials is now scheduled to be released on October 4th 2010.
We hope that this will not cause any inconvenience and are looking forward to the release of the new Doctor Who Series 5 album in November 2010.
Also, composer, Murray Gold commented on the album:
This collection is a bit different to the previous releases on Silva Screen. It’s a double CD, of course, and the tracks are drawn from four stories. Previously a single episode has had, at most, three tracks. This time, we linger somewhat longer, and there’s perhaps more a sense of passage through the stories. In some ways, it’s a more conventional soundtrack, with less zipping about through styles. We could have compressed everything onto a single disc, but Silva Screen offered to put out a double. It seemed the better route.