Oh yes, it was announced a while ago but more details only came out yesterday.
Trenzalore - don't worry, Simon, Jim and Lawry (plus Sarah and Dominique) will all be in the new series - Simon as Death and Jim as Napoleon (I think it was). Lawry, I assume, will continue to play various roles.
The link to the Simon Mayo show is here. Greg is on about 18 minutes in.
Further updates have been provided by Greg this morning on Twitter -
"1) Hi! So, yesterday we announced the new series of #HorribleHistories - the format is being tweaked. Each episode will now be a mini biography
2) Ace Jim Howick, Simon Farnaby, Sarah Hadland, Lawry Lewin, Dominique Moore, Giles Terrera & Jason Lewis are back…
3) as well as familiar faces, we have a new cast of super-talented comedy performers#HorribleHistories - see here twitter.com/greg_jenner/status/552218192152895488
4) Plus key performances from Ben Miller, Tom Rosenthal, Lorna Watson, Kathryn Drysdale, Kevin Eldon & Rowan Atkinson
5) most importantly of all, this is the first time that I have not been dressed up like an idiot for the show. Dignity. #HorribleHistories
7) #HorribleHistories episodes: Boudica,Cleo,Alfred,William I,King John, HenryVIII, MaryQofScots, Cromwell,GeorgeIII,Napoleon,Vic, Churchill
8) Death now has his own chat show #HorribleHistories
9) As ever, each episode will feature a ludicrously catchy song, composed by the musical genius Richie Webb #HorribleHistories
10) Rattus is back, but with some new musical friends to help explain the history#HorribleHistories
11) #HorribleHistories Magna Carta special will star Ben Miller as King John and songs will be part of @britishlibrary exhibition from March
The best bit of news as far as I am concerned is that Richie Webb and Dave Cohen are back on board for the songs.