An article on SFGate states that AT&T is expected to make an announcement this week that the Microcell (femtocell) will be available in the entire US. 
http://www.sfgate.com/cgi-bin/artic.../urnidgns852573C400693880002576E80066670D.DTL
http://www.sfgate.com/cgi-bin/artic.../urnidgns852573C400693880002576E80066670D.DTL