Just read this report from IGN. Todd Howard of Bethesda said that Bethesda's new unannounced game won't be using ID Tech 5 because it doesn't work well with huge, open ended games where as it does with "contained environments". But it also says that the studio has made its own engine! Ah well guess there's no ID Tech 5 for TES V and Fallout 4! And also no more Gamebyro so all you graphics whores can stop bagging the engine out!
Read the full report here. http://au.xbox360.ign.com/articles/111/1112466p1.html