Standings after R4 from official website:
The United States was invited to send a women's team to this year's championship, but it did not happen. You are free to draw your own conclusions as to why.
From Susan Polgar's chess blog:
Thursday, December 01, 2011The US refuses to send women's team to World Team Championship
Thursday, December 01, 2011More of the USCF - Women's World Team Championship Saga
Tuesday, December 13, 2011Women's World Team Championship
From Google Groups
I found it interesting that Mr. Hall never mentioned in his publicized email any concerns about the security of the chessplayers in the chosen venue. Hmmm...