So far we have seen DLC content that's has not been a disappointment. However I would like to suggest my idea. Being a truck driver I have no other real entertainment than to conjure ideas.
In this particular add-on (my label) fallout DLC: the great desert.
In this DLC the courier travels to the ncr mojave outpost. He is asked to travel to the great cajon to help a pair of special operations rangers escape from slavery.
(the setting would be barstow California to the bottom of the cajon pass towards the top of riverside and the la basin)

And then what happens?

Um... that territory is firmly under NCR control.

.http://en.wikipedia.org/wiki/Caj%C3%B3n

I'm pretty sure they wouldn't do a DLC that is faction related. Say a player was vilified by the NCR? How would they play it? :shrug:

That player might be aliened with Caesar, they may not want to release NCR rangers from slavery.

Replace NCR with talon company and California with Texas and I'm in!

Great cajon is in reference to the cajon pass in southern California between victorville and riverside.
I've been writing for weeks about a game I have titled fallout: lonestar. Takes place in Texas