It's not much, but IGN just revealed a piece of concept art for a wasp like creature we will apparently be fighting in New Vegas.

http://xbox360media.ign.com/xbox360/image/article/109/1095482/fallout-new-vegas-20100608113240024_640w.jpg

http://www.gamesas.com/index.php?/topic/1096751-fallout-new-vegas-fan-interview/

Did not see that. My bad then.