I followed up with Apple this morning on my trouble report on the WWAN update. The technician said the Apple engineering is investigating a connection between the update and certain models of Intel Macs and wireless routers.
You can help Apple troubleshoot and solve the problem by helping them collect as much relevant information as possible. If you are having Airport connection stability and reliability issues since installing the WWAN update of February 19th, open a ticket with Apple and send them the results of your system profile.
