In the latest beta, the bcm43xx driver module is loaded. You still have to do some work, at least I did. You have to install the bcm43xx-fwcutter deb and then download the appropriate firmware from linuxwireless.org. Follow the docs at linuxwireless.org and you'll be set.
I know that the deb says it's downloading the firmware, but it didn't seem to work for me.