This is a very rough guide and there is probably a much better way to do it The better way is waiting until August for the ASU to be released with a decent tool for doing this automatically

All I know is that it is working here   Oh you will want to do this all over ssh btw

Step 1: vi /etc/network/interfaces and make the wireless section look like with the obvious bits modified:

# Wireless interfaces
iface eth0 inet dhcp
wireless_mode managed
wireless_essid **********PUT YOUR ROUTER'S ESSID HERE**************
wpa-driver wext
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf


Step 2: run wpa_passphrase followed by your essid so in my case:
wpa_passphrase 100acre
It will then ask you for your WPA key
It will return a block of code all we want from this is the line beginning psk= so copy that and paste it somewhere safe.

Step 3: edit your wpa_supplicant config file :
vi /etc/wpa_supplicant/wpa_supplicant.conf
and make it look like:

# File: /etc/wpa_supplicant/wpa_supplicant.conf
network={
ssid="****PUT YOUR ROUTER'S ESSID HERE INSIDE QUOTATION MARKS"
key_mgmt=WPA-PSK
psk=******put the output of wpa_passphrase here but no quotation marks*******
}


Step 4. Edit sysconfig for wpa_supplicant :
vi /etc/sysconfig/wpa_supplicant
and make it look like:

# File: /etc/sysconfig/wpa_supplicant
INTERFACES="-ieth0"
DRIVERS="-Dwext"
Step 5: There is no step 5

Step 6: ifup eth0

The first DNS request I made took aaaaages but eventually came back then after that it has been snappy
Have fun

Any corrections / ideas let me know I know this is not perfect but it did get me online