Eurogamer Denmark just posted the news, via Kotaku. <- Link to news-article.
According to a report on Eurogamer Denmark, Elder Scrolls developers Bethesda are already hard at work on a fifth episode in the storied role-playing series.
"[Our] source not only confirmed that the game is in current production, but also spoke briefly about the content — with fantasy-sounding phrases like Dragon Lord, something with The Blades — and that voice acting for the characters in the game is currently happening in the weeks to follow", Eurogamer Denmark's boss Kristian West says.
"The same source confirmed, with official game documents in hand, that this will be the chronological sequel to what happened in The Elder Scrolls IV: Oblivion, which is the latest game in the now 16-years-old Elder Scrolls saga and by itself one of the better RPGs for PC and consoles."