Yes Season 31 and not Season 5.
A full 13-episode season will be broadcast in the Spring of 2010 (It may be spit up, the second half of the episodes being shown later on in the year). Rumours have it (info from the WHOle of the internet) that these will be the names of the upcoming episodes. If you know any better please let us know in the comments, thanks.
Episode 1 – The Eleventh Hour (an hour long episode)
and here's the list of the other episodes yet to be confirmed
13 possible Episode names for 12 Episodes
The Beast Below
Victory of the Daleks
Dalek Tea Party
Time of the Angels
Flesh and Stone
Vampires of Venice
Vincent and the Doctor
Lend Me Your Ear