In "November"'s issue of UK's PC Gamer (on shelves now) you'll find an Interview of Todd Howard as a counterpart to the obligatory Skyrim preview. Although he doesn't talk much about Fallout, the following quote may be of interest for those who fear that the series has been "Elder-Scroll-ized".
Todd Howard: We did a ton in this, yup - and to a massive level. Literally hundreds of dungeons... We realised in Fallout 3 that this kind of environmental storytelling, where you come across a little scene, is really good. So we've tried to do it more.
Looks like the door swings both ways - with Fallout now influencing Elder Scrolls.