You don’t need it if you already have AB installed on your system 
-PCMan File Manager over Thunar File Manager
-Xcompmgr-dana over Xcompmgr
-Recent Files pipemenu added
-New keybind to read the upgraded DOC
-Progress bar while copying files
-Better font rendering
-New look
-Smaller iso
-Complete list of packages found here
-Report bugs in the official bug thread
-Leave suggestions in this thread
-Have fun!
Notes:
-You can always build Arch w/ Openbox from scratch by following my guide to help you
-If you don’t like the black & gray system tray icons, remove the following line in tint2rc:
‘systray_icon_asb = 100 -100 -25′
-If you have 2 network manager icons, remove ’(sleep 3 && /usr/bin/nm-applet –sm-disable) &’ in Preferences>Openbox>autostart
EDIT:
ArchBang 2011.11 is this year’s last release!
As of next year, the name format will change from ArchBang YYYY.MM to ArchBang SEASON-YYYY so the next release will be ArchBang Spring-2012 on March 21st 2012 
2nd Edit:
-No more IRC channel since none of the mods/admins are even using it. Please use the forums instead for anything