Fallout Online
Not a fallout 2 mod
Earlier today I was checking the top upcoming games of 2011-2012, and guess what I saw? concept art for fallout online, the fallout franchise's (and rather early) sequel.
The game is being developed by Interplay, who are currently stuck in a lawsuit with Bethesda over Fallout's rights. So something there might backfire before the intended beta release in 2012, but interplay doesn't seem to think so, considering they just opened up beta registration
http://www.fallout-on-line.com/ for the game's website.
I'll be updating this thread as new goodies come in.