Barcelona will be with BIOS update. So will Penryn. Penryn BIOS updates are said to be only to recognize the CPU.

http://www.anandtech.com/tradeshows/showdoc.aspx?i=3006
AMD's partners just recently received their first "production quality" Barcelona samples, and as expected, the current boards required some heavy BIOS work before the new chips would even work, much less perform up to the expectations set by AMD.