Edit: Silly me, I forgot this was announced as part of the collector's edition.
There will be a graphic novel based on Obsidian Entertainment's upcoming Fallout: New Vegas, according to Obsidian's Chris Avellone. Chris let the news slip via his twitter feed when asked what he was writing:
Seeing the coloring and the lettering coming in for the Fallout New Vegas graphic novel, Dark Horse rocks.
Prior to that, he tweeted the following:
watching the graphic novel take shape, fucking awesome.
It's not clear whether or not Chris is writing the graphic novel at this time.