So here is the list of names for the series four titles.

1. Partners in Crime - Russell T Davies
2. The Fires of Pompeii - James Moran
3. Planet of the Ood - Keith Temple
4. The Sontaran Stratagem - Helen Raynor
5. The Poison Sky - Helen Raynor
6. The Doctor's Daughter - Stephen Greenhorn
7. The Unicorn and the Wasp - Gareth Roberts
8. Silence in the Library - Steven Moffat
9. River's Run/ Forest of the Dead - Steven Moffat
10. Midnight - Russell T Davies
11. Turn Left - Russell T Davies
12. TBA - Russell T Davies
13. Journey's End - Russell T Davies

So many Questions