In my league, we're waiting for the NFL conference call announcement. However we've considered a separate email submission of a contingency player, if the game is cancelled or delayed beyond week 2.
Don't forget that standings will be delayed and could affect waiver wire and FA pickups for week 3, if your league is designed that way.
IMO, I feel that there's ZERO chance this game will not be played somewhere, somehow this week. When Katrina hit New Orleans they didn't postpone their game, it ws simply moved to Giants stadium and treated like a Saints home game. Yikes!!!!
Also, two NFL franchises in the 'general' area of Houston, Atlanta and New Orleans (irony anyone?) are on the road this weekend. It would surprise me to see if the NFL doesn't try to one of these locations. San Antonio is a great suggestion, too, as this was the foster home of the Saints after Katrina.
In the end, I bet this will be much ado about nothing for fantasy football. I just hope loses in the Houston area are as minimal as possible.