According to Twitter, it looks like there might be a Fallout: New Vegas event in Las Vegas itself in the coming days. It might be a closed event for the press, but who knows, maybe they'll make some public announcement there?
Off to Vegas for the rest of the week. Sadly my Luck skill is very, very low, so I generally don't gamble.”— Jason Bergman, Twitter
Update: Pete Hines has just posted another tweet: