For those of you who weren't the biggest fans of the writing in the TES games, I have some good news for you. It appears he doesn't work for Bethesda anymore. Via Briosafreak's Fallout 3 blog:
I used to work at BSW and I still keep in touch with the guys there. On
a trip back to visit my friends there in the US
I saw some artwork for the concepts and stuff… Obviously I can’t discuss
specifics, but it looked very VERY nice. I think they are managing to make it
look far and away different from the style they use in TES games, so I think
that will help.
As far as writing is concerned, I ain’t too worried about that either.
The fact that the main writer for the TES games no longer works there means you
probably won’t have his “touch” influencing it. Which is not to say that I
think Ken would do a bad job.