The 5th one will be about the gunpowder plot.
A second "season" of Adventure Games for 2011 have been announced, but other than that we don't know. Presumably the first game (#5) will be released around the time the new season starts in the spring.
Up a Tree - Season 5, Episode 4.
Doctor Who - 1963 The Dominators Episode 5 6-5 is rated/received certificates of: Australia:PG
The Game - 2006 The Championship Game Episode 5-22 was released on: USA: 5 June 2012
It is in Episode 11, The Lodger.
Doctor Who - 1963 The Ice Warriors Episode 5 5-15 is rated/received certificates of: UK:PG (DVD rating)
Doctor Who - 1963 The Enemy of the World Episode 5 5-21 is rated/received certificates of: UK:PG (DVD rating)
The episode with all the little people is the aptly titled season 5 episode 'All The Little People'.
Play any other game on a system that isnt xbox you wont be bored for long
In the episode Bad Little Boy (Season 5, Episode 11), Marshall Lee fakes his own death.
The episode that Rainicorn has her babies is entitled "Jake the Dad". It is the 110th episode in the series and the 6th episode of season 5. The episode aired on January 7th 2013.
Doctor Who - 1963 The Curse of Peladon Episode One 9-5 is rated/received certificates of: UK:PG